GTA 4 or MGS 4 - which will sell more PS3:s?

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akuma587 said:
GTA is a bigger game and has casual appeal, so I think it will move more PS3's though. I think MGS4 is a very important rallying point for PS3 owners though, since it may very well be THE definitive game of the year.

It is bigger game because it has casual appeal. But why would those casuals buy PS3 for GTA4? It's on 360 too and Arcade is the cheapest SKU it's available to. You could mention the lack of HDD, but if you're a casual offline gamer, you don't need the HDD.