Spent ages and wasted lots of money on trying to make this work. Buy an iPhone and an Apple Watch or go without was the conclusion. Everything else is absolute fucking garbage. Even the Garmin stuff is problematic. I had a Garmin watch crap out entirely while up a mountain. The Apple watch that replaced has taken a complete beating and works reliably every time and doesn't feel like I'm wearing a prison tag.
Incidentally the only activity tracking stuff that works at all outside the ecosystem is stuff that dumps GPX files. I ended up without a smartwatch at all there and just chucked a Garmin eTrex 10 in my bag for tracking and used OrganicMaps on the phone for mapping.
I wouldn't recommend sleep tracking. At least in my case, it makes me sleep worse worrying about it.
Incidentally the only activity tracking stuff that works at all outside the ecosystem is stuff that dumps GPX files. I ended up without a smartwatch at all there and just chucked a Garmin eTrex 10 in my bag for tracking and used OrganicMaps on the phone for mapping.
I wouldn't recommend sleep tracking. At least in my case, it makes me sleep worse worrying about it.