My neighbor has both the AP60 and that "other" player with the scroll wheel. I played with both. I know the AP60 has some sensitive closely spaced controls, but... That "other" player was so small it was hard to hold it and scroll. I'll bet you could get used to it, but, when strapped on a Fiio or a Mojo, it seemed like it would be clumsy. At that point, i would prefer the sensitive little buttons.
I've got both as well and my experience is the opposite so YMMW (as usual)...