It really depends on how you like to play the game. The PS3 has better wheel support at the moment. So, if you like playing with a wheel you have more choices with the PS3. (Logitech G25/27, Fanatec-everything and now Thrustmaster TS500)
Fanatec makes about the ONLY good wheel for the BOX. However, you should know that Fanatec is releasing their ubber wheel in December that trumps all their previous wheels and it's only for PS3 and PC.
Which version of the game looks best? That's easy...the PC, but who wants to slap a $4000 dollar rig together for just one game to get nicer DX11 textures

I'm sure in the coming days we'll see screen shot after screen shot between the BOX and the PS3, but really...do we have to nit pic screens to say that one shader looks better than the other?
Whatever you pick, do it for the wheel support because this version makes using a wheel almost a must.