Sur le site d'IGN
For the first time, Rockstar gave us hands-on access to both the PS3 and 360 versions of GTA IV. The good news is that no matter which system you prefer, you're going to have a great-looking game to play. There are only some minor visual differences noticeable between the two preview versions. The 360 build is brighter and has slightly more vibrant color while the PS3 build has less aliasing issues. Both display a solid, consistent framerate even during scenes with heavy pedestrian traffic and wild explosions.
Pour les anglophobes,
Xbox360 = des couleurs plus vives et un rendu plus luminueux
PS3 = moins de problème d'aliasing
Info majeur, pas de problème de framerate sur les deux versions.