Tread carefully...Might want to add Garmin to your short list. It was my alternate to AW. They've had good peer reviews for respecting user data privacy, long batteries, works with both Android and iOS.
I've owned a number of Garmin smart watches over the years - 610, 910xt, 235, Fenix5.
Maybe something's drastically changed but ... their "color displays" were absolute cr@p, the smart-watch features were largely unidirectional (phone -> watch) without a return channel on iOS for responding to messages and such, and they were bad for software being quite buggy for the first few months after a new model release.
They were all good running watches and activity counters - but much of what gave them multi-day battery life also resulted in a substantially lesser user-experience than is provided by the Apple Watch.