The most recent paper used for this meta-study is still pretty old, and this technology changes. The study tells you almost nothing that could inform a buying d

The most recent paper used for this meta-study is still pretty old, and this technology changes. The study tells you almost nothing that could inform a buying decision regarding today's Apple Watch vs. Garmin Epix Pro (as examples). The sensors on the market today didn't exist and were not evaluated in any of the papers.