I use my PS3 control for everything, well, obviously aside from playing on the 360. While the 360 controller fits the hands very well, and the stick swapped with the d-pad feeling very good versus the PS3 control, I just prefer the PS3 control, being as I've used a control that has had pretty much the same feel for over a decade about. Actually, well over a decade.
The only thing(s) I absolutely HATE about the PS3 control are the goofy back shoulder buttons. There is just so much damn button to press there.
For example, it is a good thing I got Dark Souls on 360, just set the damn PS3 control down and you'll attack when you don't want to because the fucking back shoulder buttons protrude so unnecessarily far.