Instead of focusing on which version of GTA V might be superior to the other, you should be worried about what else the consoles have to offer. This is entirely subjective, and you can't be sure what you prefer by what people on an online message board say about it.
Go read up on the exclusive games and features each console has to offer and see what appeals to you the most. Go try both consoles if you have friends that own them and see which controller feels best to you. These are much more important things than the (most likely negligible) differences there might be between GTA V on 360 and PS3, in my opinion.
If you avoid buying the 4GB 360 (which shouldn't be a problem if you have the budget for a PS3), I can hardly imagine either version of GTA V being a worse choice than the other as long as you prefer the actual console over the other.
Last edited by ZCAB; 11-12-2012 at 12:00 PM..