Absolutely.. I've registered more indie apps on the Mac that I ever did on the PC, and to be honest my overall impression has been that the average quality of the stuff out there for the Mac has been far better too.
Definitely. I've registered many indie apps on my Mac and they are all top notch in quality. Not that Windows doesn't have good apps but stuff on the Mac seems to ... I dunno, try harder? Something. Definitely better quality stuff and better designed. Maybe it's a side effect of the OS itself.