I went from a Pebble Time to a Garmin Forerunner. Amazing battery life (2 weeks vs 5 days). But the software on the now defunct Pebble was massively superior. Sleep tracking on the Garmin sucks despite it having many more sensors. The Pebble pretty much always recognized short naps, and was pretty accurate with sleep/wake times.
The Garmin’s UI is also dogcrap. For example, if you get a text, it first pops up with the name of who’s texting you. You have to wait two seconds before the actual text shows up. If someone texts you again, the name pops up. You kinda have to wait for the other person to stop sending texts to be able to read anything.
I wish we could have Pebble’s software in the body of a Forerunner. Sadly Fitbit bought Pebble and subsequently threw it in the trash.