The first thing they mention is the "great" battery life and it is still only just over 2 days, great.
(Cue joke about triathletes not being serious about cycling.)
In any case, it’s longer than the AWU by a long way.
Data accuracy most certainly is not in relation to GPS which often cuts distances on the Apple Watch.
Tracking performance on the previous Apple Watch Ultra 3 was "solid" in an independent test. A little worse than competitors in some activities, a little better in others.
https://www.dcrainmaker.com/2025/11/apple-review-ultra-3-in-...
Apple Watch is probably Apple's shittiest product today.
Pedometer apps that pull from Apple Health and offer Watch face complications are a dime a dozen in the app store.