I was leaning towards getting the 38mm but it felt small on my 160mm wrist... I read somewhere here that <=170mm should go for 38mm but I'm going for 42mm without a second thought. (I'm a male, FYI) If you don't want your entire wrist to be filled up with the screen, then you should go for 38mm (for some reason it looked small on my wrist.) P.S. The tactic feedback was actually just right for me. It literally felt like someone tapping on my wrist haha. And I had to adjust the band so that its at its smallest size. Sorry for no pics, they didn't allow me to take any photos besides the display one.