OP may not have, but I have. Near universal size for Android watches seems to be 42mm (and 12mm thick). Roughly that used to be a common size of pocket watch. I don't want a pocket watch on my wrist. Apart from anything else I'll be forever bashing it. I'd rather have a smart fob watch! :p
Pebble Time Round was around 36mm and 7.5mm thick. It actually looks like a normal watch on your wrist. With 3 times the battery of Android.