Compare Samsung Galaxy Watch Ultra (2024) vs Amazfit T-Rex 3 Pro

Blood oxygen evidence was limited and negative, with one review finding the overnight readings unusually low versus other wearables.

Blood oxygen tracking received limited but positive evidence, with one reviewer saying it matched a comparison watch’s 96 percent reading impressively.

Payments were useful and reliable in the positive evidence, though one reviewer found PIN friction annoying.

Contactless payments are a repeated weakness because Zepp Pay does not work in the United States for one reviewer and drew another dismissive Apple Pay comparison.

Compatibility was a recurring concern: reviewers praised Samsung ecosystem integration but criticized Samsung-phone-only features and Android-only restrictions.

Cross-platform compatibility is a clear strength, with reviewers praising support for both Android and iOS.

Size options were a common limitation because the watch only comes in one large 47mm case and several reviewers found it bulky.

Size options are a clear improvement because reviewers liked the addition of 44mm and 48mm cases for different wrist sizes.

Stress tracking was weak in the available evidence, with one review calling it an afterthought and another saying it made them more stressed.

Stress tracking has limited positive evidence, grouped with sleep tracking as commendable in one review.

Software smoothness was a strong point, with reviewers repeatedly describing the interface as snappy, glitch-free, or without lag.

Software smoothness varies sharply. Some found the interface snappy, but many reviewers reported lag, rough edges, immature software or unfinished features.

The user interface was praised by the reviewers who scored it, especially for refinement, tiles, and intuitive operation.

The user interface is polarized: a few reviewers found it intuitive enough, but several criticized rough edges, poor flow or very frustrating UX.

Bluetooth-related sensor connectivity drew criticism in the FTP/power-meter context, where the connection was described as spotty.

Bluetooth support drew limited positive evidence, mainly around the ease of pairing external sensors over Bluetooth.

Wear OS app access was treated as a major strength, with reviewers citing useful mainstream apps and thriving third-party support, though not every customization app remained compatible.

The app ecosystem is mixed-to-weak: reviewers liked having some apps and watch faces, but repeatedly said Zepp’s app store lacks big names and trails Apple or Google.

Charging convenience was mixed: one reviewer liked infrequent charging, while others disliked losing reverse wireless charging.

Charging convenience is generally positive, with reviewers liking the compact magnetic USB-C puck or reporting easy charging, despite some charger-position caveats elsewhere.

ECG evidence was limited and lukewarm, with one reviewer finding it interesting but not personally necessary.

ECG functionality is a weakness because reviewers explicitly flagged ECG as missing or something that might put buyers off.

Pairing reliability was mixed: phone/GPS pairing could be easy or reliable, while power-meter pairing was strongly criticized.

Pairing reliability has limited but strong evidence, with one reviewer reporting a totally reliable phone connection.

Value was one of the most contested areas because reviewers liked the watch but repeatedly compared its $649 price against cheaper Galaxy alternatives.

Value for money is broadly strong, with many reviewers calling it a steal, crazy value, or an excellent feature set for the price, though critical reviews still recommend alternatives for polish.

Smartwatch features were praised overall, especially for Samsung users, though some reviewers stressed it is still a large, premium sports-style smartwatch.

Smartwatch features are mixed. One reviewer found them strong outside Apple/Samsung/Google, while others found them limited, annoying, or less complete than premium ecosystems.

Water resistance was useful for swimming and surf-style testing, but reviewers repeatedly cautioned that it is not a true dive-sports watch.

Water resistance gets positive evidence from reviewers who accepted the 10 ATM/dive positioning and one who said it worked beyond 45 meters in testing.

Safety features had limited positive evidence, with the emergency siren described as loud enough to be meaningful.

Safety features are a weakness overall. The flashlight/SOS modes help somewhat, but reviewers criticize the lack of fall detection, crash detection, SOS, satellite messaging or LTE.

Charging speed was a repeated weakness, with reviewers often reporting around two hours or saying faster charging should be expected at this tier.

Charging speed is mixed: one review called a full recharge slow at about two hours, while others said the watch charges fast or can be topped up quickly.

LTE connectivity evidence was opinionated around the forced LTE/cellular model, which one reviewer disliked because there was no cheaper Bluetooth-only version.

LTE connectivity is a weakness because reviewers explicitly call out the lack of LTE, 5G or cellular support as part of the safety and smartwatch tradeoff.

Music controls had limited but positive evidence, with one reviewer liking the ability to pause or skip audio from the watch.

Music controls are limited but usable: reviewers note phone playback control as a nice feature, while warning that streaming-service support is absent.

Display quality was one of the strongest areas, with reviewers calling the AMOLED screen excellent, gorgeous, and among the best on Android watches.

Display quality is mostly good thanks to brightness and sapphire, but reviewers noted fingerprints, smearing or cleaning issues in some tests.

Workout variety was good for mainstream exercise and multisport use, though one review noted the data-field depth still trails endurance-focused rivals.

Workout tracking variety is a strong point, with reviewers repeatedly noting an unusually large number of sports and activity profiles.

Voice assistant evidence was limited but positive when using Google Assistant instead of Bixby.

Voice assistant quality is mixed. Zepp Flow can be powerful and useful for commands, but reviewers also saw failed queries, misheard contacts or limited reliability.

Call handling had limited but positive evidence, with one long-term reviewer saying calls worked well enough to use more often.

Call handling is mixed. Several reviewers found Bluetooth call quality useful or surprisingly good, while others said the speaker and microphone were not loud or high-quality enough.

Recovery insights were useful when tied to Energy Score, Wellness Tips, sleep score factors, and physical recovery context, though reviewers did not treat them as perfect.

Recovery insights are uneven. Reviewers liked alignment with Garmin or BioCharge concepts, but criticized lack of detail, half-baked insights or needing to wear the watch overnight.

Companion app feedback was limited but negative because one reviewer disliked needing three separate Samsung apps to access full watch functionality.

The companion app divides reviewers: some call Zepp insightful, intuitive or well presented, while others find it clunky, unpolished or poor for training workflows.

Wellness insights were mixed: Energy Score and tips sometimes felt useful or accurate, while AGEs and some readiness-style metrics were vague or inconsistent.

Wellness insights are mixed-to-positive. BioCharge and HRV can feel useful and aligned with how reviewers felt, but some reviewers wanted deeper or more cohesive detail.

Notifications were generally useful and prompt in the scored evidence, helping the watch function as a less distracting phone extension.

Smartphone notifications are mixed: they arrive reliably and can be useful, but reviewers criticized limited replies, missing rich interactions or excessive buzzing.

Health tracking accuracy was mixed: some readings closely matched controls, but broader health metrics and fitness tracking drew caveats.

Health tracking accuracy is generally positive in the evidence, with reviewers reporting close alignment with chest straps, comparison watches, Oura data or HRV expectations.

Band feedback was split: several reviewers liked the ease, comfort, or redesigned mechanism, while others criticized the Marine or stock band design.

Band feedback is mixed. One reviewer liked the Pro’s improved quick-release setup, while several complained the strap was fiddly, sticky, or not as nice as premium rivals.

Coaching evidence was limited and mixed, with strength-training voice guidance seen as potentially useful but dependent on the user’s routine.

Coaching features are underdeveloped in the evidence. Reviewers found Zepp Coach suggestions awkward or described training insights as still a work in progress.

Touch interaction was mixed: the touch bezel could be excellent, but wet or sweaty workout use remained a clear limitation.

Touchscreen responsiveness is generally positive in limited evidence, with reviewers calling touch interaction responsive, flawless or well executed alongside buttons.

Navigation was a weak spot: reviewers liked basic Track Back or GPX-style routing but criticized missing maps and bare-minimum routing.

Mapping and navigation are the most divided area. Reviewers praise full-color/offline maps, but routing, rerouting, route creation and map transfer are often described as clunky, inconsistent or unreliable.

Reviewers generally praised automatic workout detection, saying it started or paused workouts reliably and often worked without asking for confirmation.

Automatic workout recognition was praised in one full review for consistently picking up common activities such as walking, running, cycling and swimming.

Build quality was a standout strength, with reviewers repeatedly calling it top-notch, excellent, solid, or tank-like.

Build quality is praised as robust, premium for the price, and materially upgraded, especially where reviewers focus on the titanium-and-sapphire hardware package.

Operating system feedback was mostly positive for Wear OS completeness, though the one-year review noted a One UI update skewed some running metrics.

The operating-system experience is mixed. Some found ZeppOS logical and easy, while others said it lacks polish or feels immature versus rivals.

Customization was praised for giving easy access to preferred health information and allowing users to tailor the home screen.

Customization received limited positive evidence around clear data presentation and configurable workout stat screens.

Heart rate accuracy was good for many runs and workouts, but several reviews found sport-specific misses, especially cycling, rowing, or rough conditions.

Heart rate accuracy is mixed-to-good. Many reviewers found it solid, close or pleasantly surprising, but others saw sketchy readings, cadence lock, rough-ride drift or weaker accuracy than Garmin.

Comfort was highly wrist-dependent: several reviewers found it comfortable despite the size, while others said it disrupted sleep or remained hard to forget.

Comfort is mixed and size-dependent. Some found the big watch wearable or better than expected, while another could not sleep comfortably with the 48mm case.

Battery life was one of the clearest improvements, usually landing around two to three days, though reviewers still noted it falls short of true outdoor-watch endurance.

Battery life is one of the strongest points, with reviewers repeatedly getting many days to roughly two weeks or more depending on always-on display, GPS and health-tracking settings.

Brightness was widely praised, especially the 3,000-nit display and strong automatic brightness behavior in direct sun.

Brightness is widely praised, especially the 3,000-nit display, although one reviewer noted auto-brightness can be conservative in very bright settings.

Menu navigation was one of the weaker usability areas, mainly because reviewers missed the rotating bezel and found Tile scrolling tedious.

Menu navigation is a weakness in critical reviews, with repeated complaints about extra button presses and too many steps to access tools.

Third-party app support was useful through Wear OS, but custom watch-face support created a notable limitation for one reviewer.

Third-party app support is mixed: syncing with services like Strava can work smoothly, but reviewers still criticize the lack of major on-watch apps.

Design reactions were highly polarized: some reviewers loved the bold Ultra look, while others called it derivative, bulky, or aesthetically off.

Style and design are subjective and mixed. Reviewers liked the rugged/premium look, but others found it bulky, harsh, angular or not premium-looking.

Fitness tracking accuracy was mostly positive but not flawless, with reviewers finding valid or strong data while also flagging average or sport-specific weaknesses.

Fitness tracking accuracy is generally solid, though not flawless: reviewers praised broad tracking and race/run data, while one reported missed surfing waves and another found exercise recognition only so-so.

GPS accuracy drew strong agreement: multiple reviewers found routes, lock speed, and distance tracking accurate, with only some urban caveats.

GPS accuracy is broadly praised across road runs, hikes and route comparisons, with caveats around cycling, tunnels, corners and selecting the right GPS mode.

Materials quality was praised for titanium and sapphire construction, with reviewers describing the casing and glass as premium or durable.

Materials quality is mostly praised for titanium, sapphire and premium upgrades, though one reviewer said the finish still does not match more expensive watches.

Reliability was mixed: some reviewers saw software or wear-detection quirks, while another only complained about a missing low-battery warning.

Reliability is mixed-to-poor outside core tracking. Some reviewers saw dependable battery and daily use, but several called software, navigation or readouts unfinished and inconsistent.

Durability was generally strong, supported by scratch resistance and long-term wear, though one reviewer noted everyday case indentations.

Durability was strongly praised where tested, with one reviewer saying the watch felt built to take serious knocks.

Sleep tracking accuracy was mixed: some reviewers found sleep timing and stages accurate, while others saw gaps, inflated scores, or difficulty distinguishing waking from stillness.

Sleep tracking accuracy is mixed. Some reviewers found it reliable or similar to Oura, while others felt scores were inflated or not fully convincing.

Flashlight evidence was limited but positive, with one reviewer naming the flashlight shortcut as their favorite Quick Button use.

The LED flashlight is one of the most consistently praised features, described as genuinely useful for everyday, travel, outdoor and visibility situations.

Button feedback was mixed: reviewers liked the Quick Button and tactile controls, but several missed a rotating bezel or crown-like navigation.

Button controls are generally useful, especially in wet, gloved or workout conditions, though one reviewer found the up/down buttons sticky on hikes.

Outdoor visibility was consistently strong thanks to the bright display, with reviewers reporting easy readability in sun and outdoor workouts.

Outdoor visibility is a major strength, with multiple reviewers reporting easy viewing in direct sunlight, bright weather or varied outdoor conditions.

Fit evidence was limited but positive, with one reviewer able to get a snug, usable fit from the supplied band setup.

Fit has limited positive evidence, with one reviewer saying the strap holes and stretch made it easy to get the fit right.

Watch faces were a highlight for several reviewers, with praise for aesthetics, data density, and wide selection.

Watch face quality has limited positive evidence, with one reviewer liking the variety and style of available faces.

Only the one-year review gave opinionated evidence on antioxidant tracking, and it was lukewarm because the reviewer had barely used it and noted it was not passive.

Calorie tracking was praised in one review for being native to the Zepp app and easy to use for meal logging against calorie expenditure.

Onboard music storage is limited by MP3-only playback and no major streaming-service support, which several reviewers found outdated or frustrating.

Step counting was acceptable but imperfect, with one reviewer tolerating discrepancies and another noting phantom steps while driving.

Wi-Fi connectivity drew limited negative evidence because one reviewer said map transfer was slow even over Wi-Fi.