Real owners lean toward the Fenix 8: 59% of 110 owners recommend it, vs 45% of 64 for the Apple Watch Ultra 3.
Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score
Most owners land firmly in the recommend camp, praising the Apple Watch Ultra 3's heart rate accuracy (several say it beats their old Garmin Epix or Fenix), its deep integration with the Apple ecosystem, and battery life that comfortably covers long runs and full days without complaint. It's also called comfortable enough to sleep in, which a few owners specifically call out as a pleasant surprise. But a meaningful minority disagree hard: a steady stream of comments describe owners ditching the Ultra 3 for a Garmin Fenix, Enduro, or Tactix once training gets serious, citing better dedicated sports tracking and multi-day battery life the Apple Watch can't match. Smaller gripes include occasional heart-rate drop-outs during runs (prompting chest-strap use), the watch's large/clunky size, and fiddly workout controls like the two-button pause.
Most Fenix 8 owners are genuinely happy, praising its reliability (many report zero bugs or issues), strong battery life on the Solar/MIP models, a sharp AMOLED or sunlight-readable MIP screen, scratch-resistant build quality, and small surprise wins like the built-in flashlight. A vocal minority pushes back hard, though, centered mainly on price — repeated complaints that the cost, often north of $1,000, isn't justified by what's actually new. That group also cites launch-period software bugs and glitches, the lack of cellular/LTE, accuracy regressions in heart-rate and GPS versus older Fenix and Forerunner models, and a sense that the upgrade over the Fenix 7 is too incremental to bother with. In short: owners who bought in love the day-to-day experience, while skeptics are mostly staying on older watches over price and diminishing-returns concerns rather than any single hardware failure.
“I love my AWU1, but please make a round one!”— samwcook21 on Reddit
“I have ultra 3 sleep with isuses very nice best”— WeekendTall7500 on Reddit
“This has convinced me that I probably need a garmin. I take my Ultra 3 off after training and I hate smart watch features.”— Few-Introduction5414 on Reddit
“Its amazing especially because it is an extremely dangerous sport when being a type 1 diabetic”— @Tentoumushi69 on YouTube
“I came from Apple Watch to the Fenix 8 about 2 months ago, love it. Zero issues, zero bugs.”— @rb3tactical145 on YouTube
“Price is ridiculous and the features do not justify it.”— @bellosthomas on YouTube
Real owners lean toward the Fenix 8: 59% of 110 owners recommend it, vs 45% of 64 for the Apple Watch Ultra 3.
Owners point the Apple Watch Ultra 3 at apple ecosystem users who want a smartwatch first, fitness tracker second, and runners and swimmers satisfied with solid (not Garmin-grade) HR and GPS accuracy.
Owners point the Fenix 8 at hikers, divers, and outdoor athletes who want rugged multisport tracking with solar/long battery options, and upgraders from older Fenix/Forerunner models wanting AMOLED or MIP display choice, buttons, and a bigger sunlight-readable screen.
The most-cited downside of the Apple Watch Ultra 3 is a recurring subset of owners end up switching to or preferring Garmin (Fenix 8, Enduro 3, Tactix 7) for serious training and fitness tracking, citing better dedicated sports features. For the Fenix 8, it's price is the single biggest complaint — many call the cost (often $1,000+) unjustified given how minor the upgrade feels.