360 - Army full of 12 year olds and frat guys and some others who all must pay in order to fight. Those malfunctioning weapons and tech don't pay for themselves ya know. Constant use of guerilla tactics and swearing.
PS3 - There wouldn't be any people fighting, just a couple of do-everything PS3s to fight. And these PS3s would be dressed so extravagently in the latest graphics. Only a few of the few robots could communicate due to few owning a mic. Speeches by leaders are always hilarious or odd.
Wii - Rough looking Miis with Rayman hands to punch the living daylights out of people. All soldiers join together in a parade and are specially trained in the art of archery, jet skis, and table tennis.
PC - Sends information among each other through Youtube. Controls the networking systems. Sit back as the watch the actual consoles wars among the others with the knowledge that the PC is not a console.