Xero on 13 April 2010
I would have gone with Toy Story too.
But if I had to make a choice between these two, and already owned SFIV I would go with GTA. SFIVS is just a few extra characters, don't listen to people who say no one would play online on SFIV after SFIVS is released, that's just not true. You can still get online games on SSF2THDR, just like people still play Madden 09 even though current is Madden 10.
