i've always been an xbox guy too, so that helps. i never liked the PS controller. always felt cheap to me and i don't like where the left thumb stick is. i'm a person that equates heft to value and the xbox controller makes me feel like it's better constructed even though i know that's not really the case.
and i really don't like the ps3 operating system. it really needs an update. that cross-hair... thingy (whatever it's called) is pretty dated.
my gripes are mostly aesthetics and not about how powerful the ps3 is. it's an amazing machine. but they did push me to use my xbox more. i could use it for netflix and such, but xbox with the kinect and the new UI is awesome.