PS3.
And after playing a bit more, the people saying this game is a solid 30 fps with just some slight dips are frankly full of crap. It is 30 fps occasionally, but it seems to be closer to 20 fps more than that. At least while driving in the city with a lot of cars around, which is most of what I've done so far. I would honestly say it's as bad as GTA IV much of the time. It does look a lot better, of course, but it doesn't really seem to run better when there's a lot going on. That said, it does reach around 30 fps when there's less going on, which certainly couldn't be said about IV!