Leaning toward the PS3 version.... Here are my reasons:
1. The DMC series are Playstation to start with, so it's only natural to be played on the Playstation controller. X360 is fine, but i don't like the trigger buttons as some punching/kicking button (don't feel right).
2. As to rumble, i'll be getting the new PS3 controller anyway... Yes, it's $50 more, but so what, it's for all of the other PS3 games.
3. Loading times... yes, the PS3 will take up some HDD space, but no biggies, upgrading to a bigger HDD on the PS3 is cheaper than X360.
4. My X360 replacement is running smoothly for now, but i'm not gonna risk another can't-play-shit-for-a-month moment.