Compare Samsung Galaxy Watch Ultra (2025) vs Polar Street X

Heart-rate accuracy is generally good for running and daily fitness, though scientific testing still found better wrist options and exercise-dependent limits.

Heart-rate evidence was mixed overall: one reviewer was cautious based on prior Polar sensor testing, while hands-on reviewers reported accurate or more reliable workout data.

GPS accuracy is praised by several mainstream reviewers, but scientific testing found visible deviations and placed it behind stronger sports watches.

GPS accuracy received a positive hands-on score, with the reviewer reporting very good test results overall despite minor exceptions.

Sleep tracking earns mixed marks: reviewers liked the score and some stage consistency, but noted low awake detection and second-tier sleep-stage performance.

Sleep-stage tracking was treated cautiously; one reviewer called Polar's sleep stages mediocre, while another found SleepWise useful but warned not to fully rely on watch sleep analysis.

Fitness tracking is broadly positive for running and general activity, though scientific testing framed performance as good enough rather than best-in-class.

Fitness tracking accuracy was generally positive where evaluated, with reviewers describing reliable metrics and good all-sports accuracy in hands-on testing.

Recovery-style guidance is a weak spot in one long-term review, where the energy score felt redundant and unhelpful.

Recovery tools were viewed positively because reviewers highlighted Training Load Pro and guidance that helps users judge when to train and when to recover.

Coaching features are a standout, especially Running Coach, which reviewers found useful, personalized, or exceptionally effective.

Coaching features were valued because reviewers said the watch helps interpret training and gives guidance on whether users are on track.

Workout variety is a strength, with reviewers praising broad activity support, multisport-style capabilities, and Samsung’s wide exercise list.

Workout variety was praised thanks to broad sports support, including open-water swimming, multisport, gym workouts, and outdoor training.

Blood oxygen tracking drew a clear caveat, with one reviewer repeatedly seeing lower SPO2 results than expected from other sensors.

Blood oxygen was a clear limitation because reviewers noted the Street X lacks SpO2 measurement, especially compared with what similarly priced watches often include.

Wellness insights are useful when they explain metrics or provide coaching, though some newer metrics remain questionable.

Wellness insights were praised for useful interpretation, especially SleepWise and broader data that helps users understand recovery and daily readiness.

Battery life is a strength relative to other Galaxy Watches, but real-world results vary widely with always-on display, GPS, and travel use.

Battery life was one of the strongest attributes, with multiple reviewers praising endurance, predictability, and real-world performance.

Charging convenience is hurt by Samsung omitting the wall charger, which one reviewer called stingy.

Charging convenience was positive because the shared USB-C charger was described as useful for owners of multiple Polar watches.

Comfort varies by reviewer: some found it comfortable, including for sleep, while others felt the weight and bulk.

Comfort was praised because the watch is light for its rugged design and was described as suitable for all-day wear.

Materials quality is excellent, with praise for titanium, ruggedness, and corrosion-resistant construction.

Materials quality was mixed because the watch was rugged, but one reviewer said it did not feel as premium as titanium or stainless steel.

Fit is context-dependent: one reviewer liked the big watch on their wrist, while another found it too large.

Fit received positive evidence from the light build and smaller-wrist suitability noted by one reviewer.

Style is subjective: one reviewer loved the stylish look, while another disliked the rugged, masculine aesthetic.

Style and design were praised by reviewers who liked the rugged, different-looking aesthetic.

Water resistance is treated positively for pool, rain, snow, and diving-oriented use.

Water resistance was scored where a reviewer described the watch as very water resistant and dust proofed.

Durability is excellent across reviews, from chassis feel to military-standard claims and real-world wear with little damage.

Durability was one of the strongest themes, with repeated praise for ruggedness, military-style toughness, and daily-use survivability.

Build quality is a major strength thanks to the rugged titanium case, robust design, and adventure-ready construction.

Build quality was strong overall, with reviewers describing robust protection and a rugged, scratch-resistant construction.

Band quality is mixed to positive, with easy swaps and a robust strap system offset by dirt buildup and a hit-or-miss release mechanism.

Band quality was positive in hands-on use, with the reviewer liking the strap texture.

Display quality is consistently praised as vibrant, large, detailed, scratch-resistant, and excellent overall.

Display quality was consistently positive, with reviewers praising the AMOLED screen, sharpness, readability, and modern feel.

Brightness is one of the clearest strengths, with reviewers repeatedly noting bright output and easy readability.

Brightness was adequate but not class-leading, with reviewers noting it was not super bright or suggesting brighter-display shoppers look elsewhere.

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

Outdoor visibility was mostly workable, with one reviewer cautious in bright sun and another finding the display easy to read in all conditions.

Reliability is mostly good, but Notebookcheck reported brief display interruptions during always-on display use.

Reliability was praised in general terms through comments about consistency, daily dependability, and a tough, simple, reliable experience.

Value for money is the most contested attribute: reviewers like the watch itself but often question the 2025 refresh and launch price.

Value was the strongest consensus point, with reviewers repeatedly calling the price-to-feature package affordable, competitive, compelling, or among the best values.

ECG is treated positively as part of Samsung Health Monitor’s useful health-tool set rather than as a deeply tested medical feature.

ECG was also a limitation: reviewers framed the missing ECG sensor as understandable at the price but still a downside for users who prioritize health metrics.

Safety features are helped by LTE, which one reviewer valued for safer phone-free running.

Safety features were supported mainly by the flashlight making the wearer more visible to traffic.

The app ecosystem is strong, with reviewers citing many apps and plenty of smartwatch functionality.

The ecosystem was a recurring caveat because reviewers said Garmin still leads in ecosystem depth and polish.

Software smoothness is strong in direct testing, with smooth operation and quick app launches.

Software smoothness was split: one reviewer found Polar sluggish, while another praised the simple, less overwhelming usability.

Mapping and navigation benefit from larger storage for offline maps and route-related use, especially for outdoor users.

Navigation was useful but limited: reviewers liked route guidance for urban use, while noting the absence of full maps and limitations for mountains or trails.

The user interface is functional and approachable, though at least one reviewer found parts of the visual design odd.

The user interface drew mixed opinions, ranging from dated and sluggish to clean, simple, and beginner-friendly.

Companion app quality is mixed because Samsung still splits settings and health data across separate apps.

The companion app was one of the clearest weak points, with reviewers calling it outdated and hard to scan for key data.

The operating system experience is improved by One UI 8, with more functional UI elements and praised new software features.

The operating system itself was considered solid, with no major functional complaints, though the interface still drew criticism elsewhere.

Button controls are polarized: reviewers like the programmable/quick button, but one long-term reviewer had repeated accidental presses and wanted better workout shortcuts.

Button controls were praised in hands-on review for their large, textured feel and good appearance.

Core smartwatch features are strong, but some reviews temper praise by noting the 2025 model adds few meaningful upgrades.

Smartwatch features were seen as good enough for essentials but limited compared with fuller platforms, especially around smart features beyond notifications, weather, and music controls.

Customization is strong for widgets, dashboards, watch faces, and tiles, but workout data-screen customization drew a complaint.

Customization was viewed positively through complication/widgets customization and easy band swapping.

Auto-detection works very well for walking and running, but one reviewer found it less reliable for cycling and strength training.

The antioxidant index is consistently weak, with several reviewers calling it low-value, inaccurate, gimmicky, or only marginally responsive.

Cross-platform compatibility is limited: reviewers note Android support but no current iPhone compatibility.

Data privacy was praised by one reviewer as a reason to consider Polar, especially for European users.

The flashlight was one of the clearest wins, repeatedly described as useful, essential, visible, and sufficient for low-light situations.

LTE is a meaningful advantage for users who want to run or stay reachable without carrying a phone.

Body temperature tracking was treated as a nice-to-have rather than a major deciding feature.

Health-tracking accuracy is mixed: reviewers praised some running-related readings, but questioned HRV, blood oxygen, antioxidant-style metrics, and scientific testing placed Samsung below top-tier rivals.

Step counting is strong during normal arm-swinging walks, with a caveat that carts or strollers reduce accuracy.

Menu navigation is mixed: the digital bezel and haptics help, but reviewers miss a rotating bezel/crown and find usability reduced.

Onboard music and storage are valuable for Spotify, podcasts, media, and offline use, especially now that storage is doubled.

Pairing reliability is excellent in the Notebookcheck test, where the watch was recognized and set up without issues.

Notification handling is positive, with one reviewer noting detailed, useful notifications from the watch.

Third-party app support benefits from extra storage and useful fitness/media apps, giving users more room for services beyond Samsung’s own tools.

Gemini makes the voice assistant experience notably useful and convenient, especially because the watch screen is small.

Watch faces are a major strength, with reviewers praising Samsung’s selection, visual quality, and customization.

Size options are limited by the single large case, and multiple reviewers describe the Ultra as very big.