I’d recommend checking out Gadgetbridge. It is an open source app, with no network permission requirements, that replaces the OEM app for a large number of watches. I’m running an Amazfit GTS 4 with it and it has been almost flawless.

I see Garmins are being recommended but if you are looking for something cheaper, I’ve been extremely happy with my Amazfit watch. It has pretty much all the same functions as the Garmins but at a fraction of the cost, and is fully compatible with Gadgetbridge, so all your data is stored locally.