The one I wish still existed: The Pebble Steel. This beast had a battery that lasted an entire week on a single charge, kept basic step tracking, etc., and notifications from my phone to my wrist. It was the perfect device. I was devastated when mine stopped working.
What I used for a long time: Fitbit Versa / Versa 2. Same deal, shittier battery life. But worked really well. Build quality declined dramatically, and I had to warranty my original Versa something like 4 times and ended up with a Versa 2 as a “We’re all out of the 1st gen, take this and shut up” upgrade.
What I use now: The Pixel Watch. The battery life is trash, but the features are solid. I’ve used an Apple Watch while carrying an iPhone for a few months, and the integration with my Pixel phone is just as seamless. The weird transition from Fitbit to Pixel Watch and how the apps interact make it blindingly obvious Fitbit as a brand is done and Google intends the “Pixel Watch” brand to replace it. I actually appreciate the round watchface.
My selections are always driven though, by my desire to see data from my continuous glucose monitor (type 1 diabetes) on my wrist. Android Wear / WearOS handles that far better than an Apple Watch, and I didn’t need the insane features (or price point) from a lot of the other WearOS devices out there.