Honestly the top brand right now. And if you don't want a watch, they also have a whoop-like strap for 99.99$

I had an Amazfit GTR-4, bought a Whoop because I wanted to wear classical watches and I really can't wait for my subscription to expire so I can go back to Amazfit.

The watch is amazing - it looks great, has a long lasting battery (2-3 weeks), quite a solid app to go with it, has GPS that you can enable when you need to and has mini apps on it that are sometimes quite useful (voice notes, timers, stretches, even a ChatGPT mini-app someone made). And it's a 3 year old watch - the new ones are even better and look nicer.

While they had some issues previously with algorithm accuracy for HR and sleep, last year it has improved wildly and the updates hit the old devices too, leaving it on par with top tier watches.

I really can't imagine getting a smartwatch whose battery lasts less than 2-3 days. Makes it super impractical for any traveling/hiking/camping or any kind of a trip where you won't have your charger with you.