I've tried a couple of Garmin watches (Vivoactive 3 and Forerunner 55) and the Amazfit Bip, and this is where they all fall completely flat. The UX is just horrible by comparison. It's like these companies have no regard for designing the OS UX and are just trying to cram features in.
And the fact that companies want to make touchscreen watches is just with few/no buttons is baffling to me. Tapping tiny buttons on a tiny screen is a horrible experience. And there's tons of moving targets because of the tiny amount of real-estate.
Pebble _just got it_ with the 2.0 OS and beyond. They were a joy to use.
I begrudgingly have gone back to using an Apple Watch, because despite being subpar, the UX is somewhat together these days, just enough to be tolerable. When I move away from iOS again, I'll probably either pull out an old Pebble that still has some battery life, or a Casio GBD200, which isn't really a smartwatch but ticks some major boxes for me (always-on-display, silent vibration alarm, and timers, chief among them). The GBD200 runs on a coin cell too, so I never have to worry about charging or a replacement being difficult to find!