From the Head-to-Head article done by IGN (http://insider.ign.com/articles/846/846534p7.html) :
Overall
So which version of Burnout Paradise deserves your hard earned money? While it's a close call, the PS3 one ultimately delivers an experience that's just a little sharper, faster, and with the extra control options of SixAxis, offers an experience that you won't quite match on 360. The 360 version is excellent in its own right and, if you're not a multi-console owner, you should have no problems getting the most out of the game. If you do have the luxury of choosing consoles, the PS3 has that little extra boost where it counts. Some people might prefer the slightly brighter coloration on the 360, but for most, the added environmental detail, ubiquitous lighting effects, and slightly higher frame rate on the PS3 deliver just a little better overall experience. While we've seen lots of third party games suffer when ported from 360 to PS3, Burnout Paradise is clear proof that, when designed from the ground-up for multi-core processing, the PS3 can definitely compete with any other console out there.
Overall 1. PS3
2. Xbox 360
Now go out and buy a copy so I can take you down :) Last night I probably went to my friends menu over 20 times and no friends online.