Apple Watch is the most precise in terms of metrics, and beats even Garmin Fenix in this regard.
Other metrics are also more precise, such as sleep tracking, which in combination with other metrics, provide insight in your restitution.
The only drawbacks for Apple Watch are the low battery life and, subjectively, that it looks ugly.
Well, with how power hungry my AW8 is, it’s more like 22.5/7.