Cateva "citate" de pe forumul GTA 5 (eu nu stiu cum prind oamenii astia "la ochi" diferenta de 2-3FPS... dar in fine):
I got both versions to compare them ; GTAIV had better frame rates on the Xbox 360 but the PS3 had less pop ups and better textures , Rockstar sacrificed some elements to put more fps on the PS3 version , it's just like GTAIV versions
Actually I have both versions , I did say the game will be leaked earlier here in KSA (I got it on the 11th of September) ;

* PS3 runs Smoother
* PS3 runs at 30-35 FPS
* Xbox 360 have slightly better anti-aliasing
* Xbox 360 have less pop ups
* Xbox 360 have slightly better line draw for distance
* Xbox 360 have a more colorful environment (little noticeable)(better textures)
* Xbox 360 runs at 30-33 FPS
It doesn't mean it's worse graphics lol. Xbox uses just slightly more AA and has slightly more better textures, there isn't a big difference at all. It's essentially the same thing and we get 2 fps more and it doesn't even drop down. Same with Xbox, both parties have won this time.
PS3: 2 fps more and worse graphics.
Xbox: 2 fps less and better graphics.