The Android watch landscape is dire. All have compromises of some form.
WearOS: Outdated, ancient Qualcomm hardware makes every device feel sluggish. Most miss certain features; some have no NFC (so no Google Pay), some (e.g. Fossil) have no speaker (can't take voice calls/fully interact with Assistant). Only "do everything" devices are Huawei Watch 2 and TicWatch Pro. Former has a small screen, latter has questionable quality control. Again, both are the most full-featured WearOS devices but are sluggish due to that old chip.
Samsung: Runs own Tizen OS, so not Google services (Pay, Assistant, Maps etc). Bixby is near-useless (and S-Voice on Gear S3 even worse). Lovely hardware with slick operation but, again, new Watch Active has no speaker - so no calls.
FitBit/Garmin etc: These are more like fitness trackers with some smartwatch functionality. Models like FitBit Versa have no GPS; the better Ionic is objectively ugly. All lack core services, so no voice assistants or map integrations etc. Even basic functions like music control can be flaky.
In short, the Apple Watch is leagues ahead in almost every metric although, if you are willing to make compromises, there are some nice (and much cheaper) options for Android. It really shows how fragmented everything is, however.