Actually, the PS2 is still supported so that one would be number one if you would look at quantity, quality, price and userbase. Wii would be number 2 if you look at it's line up and sales and then comes the 360 with the PS3 rapidly closing in. All that is done with the PC as a gaming platform kept out of comparison as the 360 would be left bungling down the ropes even further then with tons of it's "exclusives" also appearing on that.
PSN name: Gazz1979 (feel free to add me, but please put your Vgchartz name in the message!)
Battlefield 2: Gazz1979