To Eraserhead above: I was referring to more than just GTA IV, but later on I'll go find the link that stated GTA IV was slightly better on Xbox 360.
that differs with everyone. IGN and 1up both mention the PS3 version runs a bit better (ie. less pop-up, shorter loads) and Dan Houser in EGM a few months back said he preferred the way the PS3 renders colours over the 360 (softer tone or something to that effect).On the other hand, the 360 is said to achieve a higher peak framerate and be a bit crisper over the slightly fuzzy PS3 version. Plus DLC, achievements, XBL etc.
Basically pick the version your friends have so you can play online with them.
But honestly, nothing against the OP but these topics are poison and really shouldn't be on the boards since they just make everyone bitch at eachother about largely meaningless stuff that we have all beaten to death, resurrected and beaten to death again.