mibuokami on 23 June 2009
I'd think that the extra userbase in the US helped a bit. Most recent release seem to have a 3:2 ratio of sale for the 360vsPS3.... Also the PS3 userbase could be split with 2 choices, not everyone is getting both Prototype and Infamous. If one of them hadn't come out, I think the sale figure would have jumped a bit for the other.
Still I think both sold pretty well.
