**NO SPOILERS**
I've had the opportunity to play this on both systems pretty well through the game. My PS3 shitted out on me about 50-60% through the first play-through...
Things are more different than I had expected.. One problem I had with the PS3 version was just that I didn't seem to make much money. The money is a lot easier to come by in the 360 version. Also, the poker is definitely more realistic. I spent time on PS3 playing poker, and at best I'd get a 7 pair or a high suit in the pocket. AT BEST. This might just be me though.
The 360 version seems to have a "fun" advantage over the Ps3, although there are a few (and I mean VERY few) pop-up issues.
I have to play this whole game again and I've already had more fun playing the 360 version over the PS3 version. I'd say it was because I know the in's and out's from playing it on PS3, but for some reason that I can't explain, the 360 version just seems more entertaining.
::shrug::