Good point, @RecoveryRx. Data is a tool, not the only answer. What about battery life for these devices? That's a consideration for me.
Oura lasts about 7 days, which is great. Whoop is similar.
Yeah, Whoop has excellent battery life. Charge it once a week, and you're good.
Fitbit usually needs charging every few days depending on features used.
Good to know about the battery life. Thanks, everyone!