Well I posted my complaints, and neither the framerate nor the tearing were among those. None of that on my screen. I can try the 360 version, but I've done so before with GRID, and the original Dirt, and the games were basically a wash on both systems back then so I'm not expecting much difference this time.
EDIT: the PS3 does seem to have more tearing though. Framerate is about the same, but a fair bit more tearing. I didn't see any of that though, maybe it's my tv.
http://forum.beyond3d.com/showpost.php?p=1324311&postcount=471
Grid also had 4xAA on 360 whereas Ps3 did not so I'm expecting the same here.