Earlier quoted context omitted.
I find the Garmin UI to be awful, and the Pebble UI to be a breeze. Also, Garmins are pretty bulky compared to Pebbles, and many of them don't have buttons that can be used to control music, for those of us who find touchscreen interfaces to be lacking.
Huh? Are you sure you aren’t thinking of another brand? Literally every garmin watch I can find on their site has buttons. The size is also very much watch specific. They will all be thicker than a pebble, but they’ll also all have far more features. Like pulse ox, which is one of the main drivers of thickness.
I think I have used the pulse oximeter maybe 1x/year, and that's counting during COVID shutdowns, when people talked about pulse ox more than in normal times.
I will keep my Garmin and will use it when exercising. But I would never buy another one as long as I can get Pebbles instead.