Will the sales gap for the next GTA game be as large as it was for GTA 4?

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A game like GTA is traditionally considered a Playstation franchise. The 360 had a considerable edge over th PS3 in the Western world, but it only outsold the PS3 version by a mere 1.3 million units.
The next GTA game will sell more on the PS3 when the install bases of both systems are closer.