Compare Garmin Forerunner 165 vs Amazfit T-Rex 3 Pro

Activity auto-detection is supported and recognized common workouts in testing, though another reviewer noted setup is required for auto tracking.

Connect IQ gives the watch a modest app ecosystem for watch faces, widgets, data fields, and extras, though it is not framed as a full smartwatch app platform.

The app ecosystem is mixed: Zepp offers apps, watch faces, and ecosystem add-ons, but reviewers say it lacks big-name apps and polish.

Reviewers generally liked the soft, adjustable silicone strap and standard strap options, with no major comfort complaints about the band itself.

Band quality is mixed to weak; reviewers like quick release but complain about fiddly pins, stickiness, thickness, and strap feel.

Battery life was praised as strong for an AMOLED Garmin in normal training use, but several reviewers said always-on display, music, or endurance use reduces its advantage.

Battery life is one of the clearest strengths, with reviewers reporting multi-day to multi-week endurance even with GPS and heavy use.

The watch includes blood oxygen or Pulse Ox tracking, but reviewers treated it as a useful health sensor rather than a headline reason to buy.

Blood oxygen tracking is present and was specifically praised in one comparison, with reviewers noting SPO2 support alongside broader health sensors.

Bluetooth and ANT+ sensor/headphone support were viewed positively, with reviewers noting external sensor support and solid headphone connectivity.

Bluetooth connectivity is necessary for calls, phone pairing, and related functions, and reviewers describe it as available and useful.

Brightness was a clear strength, especially the bold AMOLED screen and usable bright-display behavior.

Brightness is one of the strongest consensus positives, with many reviewers citing the 3,000-nit display.

Build quality was viewed as dependable for the price, with Garmin durability praised even though the plastic construction feels less premium.

Build quality is widely praised as rugged, robust, sturdy, and premium for the price.

The five-button layout was one of the most consistently praised usability strengths, especially for workouts, gloves, sweat, and wet conditions.

Button controls are useful and well-liked, especially for workouts, gloves, flashlight access, and navigation without relying on touch.

Call handling was limited to reliable call-related smartphone alerts rather than full on-watch calling.

Call handling is a real added feature through speaker and microphone; several reviewers found it useful, while others criticized volume or audio quality.

Calorie tracking received weak support; one reviewer saw calorie burn data in strength mode but did not find that feature very useful.

One reviewer specifically praised the Zepp app’s calorie logging, meal entry, and calorie-expenditure comparison tools.

Charging convenience was mostly fine thanks to secure contacts and Garmin’s familiar proprietary cable, though it is not universal wireless charging.

Charging convenience is generally good thanks to magnetic pogo-pin and USB-C puck designs, though one reviewer warns the connection can be deceptive.

Charging speed was generally acceptable to good, with reviewers reporting around one hour to just under two hours depending on the source.

Charging speed is mixed: some call it reasonable or fast enough, while others describe two-hour full charges or slow charging.

Coaching features were well supported through Garmin Coach, adaptive plans, structured workouts, daily suggestions, and race-related guidance.

Coaching features are present but uneven: reviewers mention virtual pacer, Zepp Coach, and training insights, while others call the plans or insights unfinished.

Comfort was a major point of agreement: reviewers repeatedly described the watch as light, compact, unobtrusive, and easy to wear day and night.

Comfort is mixed: some reviewers found it manageable or comfortable, while others found the chunky case noticeable or poor for smaller wrists.

Garmin Connect was mostly praised for depth, workout analysis, and improving organization, though one reviewer found the redesign not dramatically easier.

The companion app is useful and sometimes insightful, but several reviewers call Zepp clunky, unpolished, or less training-centric than rivals.

Garmin Pay was consistently mentioned as available and useful for contactless payments across models.

Contactless payments are a weak point, with Zepp Pay availability, card support, and US functionality repeatedly criticized despite NFC support.

Cross-platform compatibility is functional, but one reviewer noted the phone experience differs between iPhone and Android, especially for replies.

Cross-platform compatibility is a clear strength, with multiple reviewers confirming Android and iOS support.

Customization was strong, with configurable widgets, data fields, watch faces, and training screens noted across reviews.

Customization options are a strength, including customizable widgets, route direction choices, reorderable items, and watch settings.

Display quality was one of the strongest attributes, with reviewers repeatedly praising the vibrant, crisp AMOLED screen.

Display quality is strongly praised, with AMOLED panels, touch support, sharpness, and large screen real estate cited across reviews.

Durability evidence was positive overall, including resistance to daily abuse, though not all reviewers considered it a rugged outdoor watch.

Durability is strong, supported by rugged construction, sapphire protection, water resistance, and outdoor-focused toughness.

ECG functionality was consistently absent; reviewers repeatedly stated users need a different or higher-end Garmin for ECG/EKG.

ECG functionality is consistently absent; reviewers repeatedly note that the T-Rex 3 Pro does not include ECG support.

Fit was generally positive, with the small case sitting neatly on wrists and under layers without feeling oversized.

Fit is mostly good when adjusted, but one reviewer reported a gap that may affect heart-rate accuracy.

Fitness tracking accuracy was praised across multiple reviews, especially for daily activity data, run metrics, and overall sensor reliability.

Fitness tracking accuracy was mostly positive across general activity, sleep, walk, and exercise tracking, though strength-recognition evidence was mixed.

GPS accuracy was a major strength; most reviewers found it accurate or solid despite the lack of dual-band GPS, with only occasional challenging-environment issues.

GPS accuracy was one of the better-reviewed areas, with most reviewers finding accurate routes, fast locks, and reliable distance, though cycling and routing edge cases remain.

Health tracking accuracy was supported by the reliable sensor package and detailed data collection, but evidence was less extensive than for GPS and heart rate.

Reviewers who compared the health sensor against other devices found broad health metrics close, with strong heart-rate-adjacent data and blood oxygen support.

Heart rate accuracy was broadly positive, often matching chest straps or higher-end watches well, with occasional optical-sensor lag or spikes.

Heart-rate accuracy was generally solid to strong, though harder workouts and some wrist-fit conditions produced drift or cadence-lock concerns for a few reviewers.

LTE connectivity is not available; reviewers repeatedly state that calls and smart features require a nearby phone.

Navigation is useful but limited: reviewers liked breadcrumb routing, courses, back-to-start, and GPX support, while noting the absence of full maps.

Materials quality was a tradeoff: the polymer/plastic body helps weight and price but feels less premium than metal.

Materials quality is a major strength, with titanium, sapphire, and reinforced polymer repeatedly cited as premium upgrades.

Menu navigation is flexible because Garmin allows almost everything to be controlled by buttons, reducing reliance on touch.

Menu navigation is often criticized for extra clicks, clunky flow, and awkward steps during routing or settings changes.

Music controls were a weak spot, with reviewers finding on-run controls unintuitive or limited without the Music model.

Music controls are useful for controlling phone playback, while reviewers note the watch can also manage local music playback.

Onboard music storage is useful on the Music edition, but reviews were split because syncing can be tedious and costs extra.

Onboard music storage exists through uploaded MP3 files, but the lack of offline streaming makes it feel dated or limited to several reviewers.

The operating system experience felt Garmin-like and sport-focused, with solid hybrid smartwatch behavior but limitations versus true smartwatches.

The operating system experience is mixed: Zepp OS can be logical, smooth, and snappy, but some reviewers call it proprietary, rough, or half-baked.

Outdoor visibility was a standout strength; reviewers repeatedly said the AMOLED screen was readable in sunlight and bright conditions.

Outdoor visibility is excellent in the review evidence, with repeated praise for readability in direct sunlight and challenging outdoor conditions.

Pairing reliability was specifically praised for Bluetooth headphones in one review, with no broad pairing complaints across the review set.

Pairing reliability is strong in the limited evidence, with reviewers noting reliable phone use and the ability to pair external sensors.

Recovery insights are useful through Recovery Time, Training Effect, HRV, Body Battery, and related tools, but the missing Training Readiness and Training Load limited depth.

Recovery insights are useful but uneven: BioCharge, readiness, VO2 Max, training load, and recovery time appear, but some reviewers wanted more detail and cohesion.

Reliability was praised in long-term and general-use terms, with reviewers describing the watch as dependable and accessible.

Reliability is a weak area for advanced features, especially routing and rerouting, though basic navigation sometimes worked acceptably.

Safety features were positively noted through LiveTrack and incident detection, though the evidence came from one detailed review.

Safety features are mixed: the LED flashlight is widely loved, but crash detection, LTE, SOS, and stronger emergency tools are missing.

Size options were a weakness because reviewers repeatedly noted there is only one case size, despite the size working for many wrists.

Size options are a major improvement, with reviewers repeatedly noting 44mm and 48mm choices for different wrists.

Sleep tracking was mostly useful for sleep duration and scores, but opinions were mixed because at least one reviewer found missed restless sleep.

Sleep tracking drew mostly positive but not perfect feedback; several reviewers found duration or trends plausible, while others felt scores could be inflated.

Smartphone notifications were considered reliable and readable, with texts, calls, and app alerts working well when paired.

Smartphone notifications generally arrive and display well, but response options and notification richness vary by phone and platform.

Smartwatch features were solid for a sport watch, including notifications, wallet/payments, Find My Phone, music, and safety tools, but not full smartwatch depth.

Smartwatch features are adequate for basics like calls, notifications, assistant tools, music controls, and flashlight, but reviewers repeatedly say they lack premium polish.

Software smoothness was acceptable but not premium-watch smooth, with one review noting the refresh rate was not Apple Watch-like.

Software smoothness is a recurring weakness, with complaints about lag, rough edges, unfinished rerouting, immature UI, and half-baked features.

Step counting accuracy was positively supported by one review that found it closely matched other tested devices.

Stress tracking was present as part of the broader Garmin health and sleep feature set.

Stress tracking is included through the BioTracker health suite, with reviewers describing stress and sleep tracking as commendable or reliably available.

Style and design were viewed positively for a sporty, compact watch with a bright display that could be worn daily.

Style and design are polarizing: reviewers appreciate rugged outdoor aesthetics but warn the chunky, angular look is not for everyone.

Third-party app support exists through Connect IQ widgets, watch faces, data fields, and apps, but reviewers did not portray it as a rich smartwatch store.

Third-party support is limited but not absent: syncing with fitness platforms is useful, while major onboard apps and streaming services are missing.

Touchscreen responsiveness was mostly praised as smooth and useful, though one reviewer noted accidental touches.

Touchscreen responsiveness is generally good, with reviewers calling it flawless, touch-enabled, or free of tap-and-swipe issues.

The user interface was considered approachable and easy to use, especially with the combined touchscreen and button approach.

The user interface splits reviewers: some found it intuitive or logical, while others criticized frustrating flow, limited polish, or immature presentation.

Value for money was one of the strongest consensus points, with many reviewers calling the 165 a strong budget or sweet-spot Garmin.

Value for money is broadly strong because reviewers see premium hardware, maps, battery, and outdoor features at far lower prices than rivals.

Voice assistant quality is effectively absent because one reviewer explicitly noted there is no voice assistant.

Zepp Flow is frequently described as capable and useful for commands, questions, and starting activities, though one reviewer found it unreliable after misunderstandings.

Watch face quality was strong thanks to customizable stock faces and Connect IQ options.

Watch face quality has limited but positive evidence, with one reviewer highlighting many varied, free watch faces.

Water resistance was well supported for swimming, rain, sweat, and shallow water, with reviewers noting 5ATM or 50-meter resistance.

Water resistance is a clear strength, with reviewers noting 10 ATM protection and recreational scuba or 45-meter diving support.

Wellness insights were strong through Morning Report, Body Battery, HRV, sleep, stress, recovery, and daily health glances.

Wellness insights are broad and often useful, especially BioCharge and readiness-style metrics, but depth and presentation vary by reviewer.

Wi-Fi connectivity exists mainly for the Music edition and music syncing, but one review reported Wi-Fi troubleshooting friction.

Wi-Fi connectivity is present, though one reviewer notes it is limited to 2.4GHz and another groups it with syncing maps and music.

Workout tracking variety covers most common running, cycling, swimming, gym, yoga, and fitness modes, but reviewers repeatedly noted missing triathlon, skiing, and other niche profiles.

Workout variety is a major strength, with reviewers repeatedly citing roughly 180-plus activity profiles, triathlon, Hyrox, running modes, swimming, and diving support.