Compare Garmin Forerunner 255 vs Samsung Galaxy Watch Ultra (2025)

Auto-detection evidence is positive but limited, with reviewers noting automatic run/walk/rest or effort detection rather than broad automatic workout recognition.

Workout auto-detection is broadly useful, with reviewers citing automatic workout detection and reliable walk detection, though manual starts remain better for some activities.

The app ecosystem is supported through Connect IQ and Garmin's watch-face/app store, but the evidence emphasizes fitness tools more than a broad app marketplace.

The app ecosystem is a strength: reviewers mention many available apps, Google Play access, and expanded usefulness from the extra storage.

Band quality is strong, with reviewers praising the silicone quick-release band, stretch, comfort, notches, and easy swapping.

Band feedback is mostly positive for comfort, stability, and easy removal, though one reviewer noted dirt collecting in the strap holes.

Battery life is one of the clearest strengths, with reviewers repeatedly reporting week-plus use, two-week smartwatch estimates, and strong GPS endurance.

Battery life is one of the clearest strengths, often described as the best in Samsung’s lineup, though heavy GPS or always-on use can reduce it.

Blood oxygen/Pulse Ox support is present and mentioned often, but reviewers treat it as secondary because continuous use can hurt battery life and accuracy depends on conditions.

Blood oxygen tracking is present across the health sensor set, but one long-term reviewer found SpO2 readings routinely low.

Bluetooth connectivity is strong for headphones and external sensors, with reviewers noting Bluetooth audio and ANT+/Bluetooth sensor pairing.

Bluetooth support is present, including Bluetooth 5.3 mentions, but external sensor connections were criticized or described as unavailable.

Brightness is mixed: the display is readable, but multiple reviewers prefer brighter AMOLED screens or say brightness could be better.

Brightness earns strong praise, with reviewers citing high nits, bright AMOLED output, and easy readability.

Build quality is generally good for a lightweight sports watch, but reviewers note the plastic/resin construction feels cheaper than metal premium models.

Build quality is consistently praised through the rugged titanium case, durable chassis, and robust construction.

Button controls are broadly positive, with reviewers liking reliable physical buttons for sports, though a few mention learning curves or squishy buttons.

Button controls are mixed: reviewers like the Quick/action button and programmable shortcuts, but one long-term reviewer disliked accidental presses and limited workout button behavior.

Call handling is weak because one review directly says the watch cannot make calls and lacks the hardware for calling.

Call handling is supported through Bluetooth calling, speaker/mic use, and smartwatch features for calls and texts.

Calorie tracking is mentioned as part of the workout data set, but reviewers do not deeply evaluate its independent usefulness.

Calorie tracking is included as part of the activity metrics, but the evidence is limited to feature availability rather than deep accuracy testing.

Charging convenience is mixed: the cable fits and replacement cables are available, but proprietary charging and battery drain with GPS/music are recurring caveats.

Charging is wireless and reasonably convenient, but one reviewer criticized the missing wall charging block.

Charging speed is positive, with reviewers noting full charging in a couple of hours and 50 percent charge in under half an hour.

Charging speed gets limited but positive evidence, with one review reporting a full charge in about 95 minutes.

Coaching features are a standout, with race widgets, Garmin Coach, adaptive suggested workouts, race-based plans, and workout guidance appearing across many reviews.

Coaching features are a real addition, especially Running Coach, with reviewers describing personalized plans and guidance.

Comfort is a consistent strength, with many reviewers describing the watch as light, comfortable for 24/7 wear, and easy to sleep in.

Comfort depends on wrist and expectations: some reviewers found it comfortable, while others felt the weight or bulk.

The companion app is a major strength, with Garmin Connect described as detailed, polished, powerful, and helpful for syncing, workouts, and long-term stats.

The companion app setup is useful but split, with health and smartwatch settings divided between Samsung Health and Galaxy Wearable.

Contactless payments are consistently supported through Garmin Pay/NFC, although bank participation limits usefulness for some reviewers.

Contactless payments are supported through Samsung Wallet or Samsung Pay shortcuts.

Cross-platform compatibility is positive, with reviewers noting iOS and Android support through Garmin Connect and Bluetooth.

Cross-platform compatibility is limited: reviews say it works with Android but not iPhone, with the best experience tied to Samsung phones.

Customization is a strong point, with reviewers praising data fields, watch-face changes, activity settings, and phone-based configuration.

Customization is strong across programmable buttons, widgets, tiles, colors, and watch-face data.

Display quality is practical and readable, especially for sport use, but reviewers contrast the MIP screen with brighter AMOLED displays.

Display quality is a major strength, with repeated praise for the large, vibrant AMOLED display.

Durability evidence is positive but limited, with reviewers mentioning Gorilla Glass, solid daily durability, and few scratches or cracks over months.

Durability is a standout, backed by titanium construction, MIL-STD claims, scratch protection, and reviewer reports of little damage.

ECG functionality is widely listed as part of the health feature set, though one review notes Samsung-phone pairing requirements for ECG and blood pressure.

Fit is positive, supported by closely spaced strap holes, multiple sizes, and reviewers reporting secure wrist adjustment.

Fit is polarizing: it can fit some larger wrists well, but reviewers also note the single 47mm size and large wrist footprint.

Fitness tracking is described as accurate and detailed across workouts, with reviewers highlighting strong sport data, reliable modes, and post-workout analysis.

Fitness tracking accuracy is generally good for everyday and running use, though scientific testing places it below the top alternatives.

GPS accuracy is one of the strongest consensus points, with reviewers praising multi-band GNSS and reporting excellent or near spot-on tracking in varied conditions.

GPS accuracy is good in several reviewer tests and supports dual-frequency GPS, but scientific testing found some route deviation.

One review says the watch helps build an accurate picture of day-to-day health, based on heart rate, SpO2, sleep, stress, and related health stats.

Health tracking is feature-rich but mixed in accuracy, with strong sensor coverage offset by questionable antioxidant, HRV, and some sleep-stage findings.

Reviewers repeatedly report strong wrist heart-rate accuracy, often comparing it favorably with chest straps, though one notes chest straps remain preferable for maximum precision.

Heart-rate accuracy is strongest in running evidence, with one reviewer matching a Polar strap closely, while scientific testing calls it good rather than elite.

LTE is a consistent advantage because it is standard or broadly available, though one reviewer notes carrier setup can cost extra.

Navigation support is useful through offline maps, Google Maps routing, and GPS widgets, but one reviewer notes no built-in maps on-watch.

Materials quality evidence is limited and mixed, with one review identifying the resin case and silicone band rather than premium materials.

Materials quality is strong, centered on titanium, sapphire/robust design references, and corrosion-resistant claims.

Menu navigation is mixed: Garmin's button/menu system works and can be quick, but reviewers note a learning curve and limited mapping/navigation depth.

Menu navigation is mostly straightforward through swipes, app drawers, digital bezel haptics, and simple operation.

Music controls are useful, with reviewers noting phone playback control and on-watch controls such as changing, pausing, and playing tracks.

Music features are useful for downloaded Spotify, streaming, media tiles, and larger storage for music.

Onboard music storage is a clear optional strength on Music models, with Spotify/offline playlist support and roughly 500-song storage noted, though storage is limited versus higher models.

Onboard storage is a clear 2025 upgrade, repeatedly described as 64GB and useful for music, apps, and offline maps.

Operating system experience is functional and familiar, with Garmin's watch software described as consistent and usable rather than lifestyle-watch rich.

The operating system experience benefits from One UI 8/Wear OS updates, Gemini, Now Bar, and refreshed interface features.

Outdoor visibility is strong, with reviewers repeatedly praising MIP visibility in direct sunlight or bright outdoor conditions.

Outdoor visibility is excellent, with multiple reviewers saying the bright display remains readable in sunlight.

Pairing reliability evidence is limited, but one cycling review successfully paired power-meter pedals and used the data without complaint.

Pairing and setup reliability are positive where tested, with instant recognition and quick setup noted.

Recovery insights are a major upgrade, with HRV, Body Battery, recovery time, and training-load tools giving useful context, though Training Readiness is missing.

Recovery-style insights are mixed: vascular load interests some reviewers, while HRV and related metrics draw skepticism.

Reliability evidence is limited but positive, with one long-term reviewer calling the watch fantastic after six months.

Reliability is mostly acceptable but not flawless, with one review noting brief display interruptions and another calling performance not horrible rather than perfect.

Safety features are present through emergency assistance, live tracking, and personal safety features, but evidence assumes phone-linked or outdoor use cases.

Safety features include fall detection, emergency siren references, sleep apnea alerts, and related health/safety setup options.

Size options are a strength, with reviewers repeatedly highlighting 41/42mm and 46mm options that serve different wrist sizes.

Size options are limited by the single large 47mm format, though the band can fit a range of wrists and the screen size appeals to some users.

Sleep tracking is widely covered and generally positive, with several reviewers finding it useful or close to external sleep tools, while some still note overestimation or limits.

Sleep tracking is useful and improving, but reviewers disagree on sleep stages and awake-time accuracy.

Smartphone notifications are consistently available and useful for viewing messages, calls, texts, and app alerts, though controls vary by phone platform.

Smartphone notifications are well supported, with reviewers noting detailed notification views and suggested replies.

Smartwatch features are adequate for Garmin Pay, music, notifications, and Connect IQ, but reviewers repeatedly say they fall short of Apple or Samsung-style smartwatches.

Smartwatch features are broad, including LTE, calls, texts, Gemini, Now Bar, storage, and Samsung’s full watch software stack.

Software smoothness gets limited but positive evidence, with one review calling menuing smooth and lag-free.

Software smoothness is generally good, with smooth app launches and more functional One UI behavior, despite occasional reliability caveats.

Step counting evidence is limited and mixed: one reviewer reports an inaccurate stair count, while another calls the step counter very accurate.

Step counting is positive in basic walking tests, but one reviewer notes accuracy drops when arms are not swinging.

Stress tracking appears through HRV, Body Battery, and stress metrics, but evidence is mixed because at least one reviewer finds Garmin's stress data not very useful.

Stress tracking is included in Samsung’s health sensor set, though the reviews provide feature evidence more than accuracy testing.

Style and design are functional rather than stylish, with reviewers calling it clearly sporty, utilitarian, or not a luxury-looking watch.

Style is divisive: some reviewers like the rugged, colorful, stylish look, while others find it bulky or not pretty.

Third-party app support exists through Connect IQ and downloadable faces/apps, but reviewers describe it as useful rather than Apple Watch-level broad.

Third-party app support is solid through Google Play, fitness apps such as Strava and Map My Run, and a growing Wear OS app selection.

Touchscreen responsiveness scores low because the watch does not have a touchscreen; reviewers often frame this as acceptable for workouts.

Touchscreen responsiveness and gesture operation are described as intentional and straightforward in the long-term review evidence.

The user interface is practical, especially through glances and widgets, but some recovery/health metrics require interpretation.

The user interface is improved and functional, though some reviewers dislike parts of the visual layout.

Value for money is strongly positive for sports-focused buyers, though reviewers also mention price concerns and cheaper rivals.

Value for money is the main weak point because reviewers repeatedly question the high price and minimal 2025 hardware changes.

Voice assistant quality is a strength with Gemini, which reviewers describe as convenient, useful, and directly available on the wrist.

Watch-face quality is solid, with customizable stock faces and Connect IQ options, though one reviewer notes limits around custom Face It storage.

Watch faces are a strength, with reviewers praising quantity, customization, and Samsung’s polished face designs.

Water resistance is positive, with reviewers noting 5ATM/waterproofing and suitability for swimming, pool use, showers, and open water.

Water resistance is a strong feature, with reviews citing 5ATM/10ATM ratings, IP68 claims, and pool/rain/snow use.

Wellness insights are well represented through Morning Report, Body Battery, Health Snapshot, and sleep/recovery context, and several reviewers call these features useful.

Wellness insights are useful but uneven: sleep coaching and vascular load get interest, while energy score and antioxidant index receive skepticism.

Wi-Fi evidence is limited to Music models and syncing/downloading use cases, but reviewers confirm Wi-Fi support for those versions.

Wi-Fi support is present across connectivity mentions, including LTE/Wi-Fi model references.

Workout variety is a major strength, with reviewers emphasizing triathlon, multisport, running, cycling, swimming, open-water swimming, and many built-in activity profiles.

Workout variety is strong, with reviewers citing many tracked activities, multisport/triathlon capability, and broad exercise lists.