The Garmin watches have come a long way. I bought a 645 Music. The key feature for me over Apple or Android watches is battery life. The Garmin does many of the same things that the AW does (always-on screen, GPS, music via BT headphones, 24 hr heart rate monitoring, notifications, weather, etc). The last time I charged it was Monday, and I've done a 1 hour GPS sport activity, and other indoor activities this week. It is currently sitting at > 50% battery remaining. And this is with a lot of "fiddling" that you do with a new toy, which I'm sure runs down battery life more.

I'm coming from an Android Wear based Polar M600. It was nice, but Android Wear 2.0 was a bit of a dumpster fire and kind of ruined it (random battery rundown, Music removed on every f/w update, hard to sync Music, could not shuffle Music after Android Wear 2.0 update). In the end, I could not count on more than 8hr of battery life unless I put it in airplane mode with the screen off.

Before I settled on the Garmin, my Nexus died. I was seriously considering switching to an iPhone just to be able to use an Apple Watch. But then I learned that the AW3 has a battery life of only 18 hours. So I just updated to a Pixel and got the Garmin.

It seems like using Android / iOS for a watch OS may just be the problem. I was also considering the Fitbit Ionic, which has a comparable battery life to the Garmin. There just don't seem to be any Android Wear watches with a 5+ day battery life.