Xbox - The green flag has attracted the most vocal following. Even when their weapons of war malfunction, they hold it up as a feature, a blessing by the mighty Fhurer Gates who works in mysterious ways.
The smaller, but more elegant PS3 army, is made of powerful warriors. However, they don't work particularly well together, and can't be bothered to communicate with their brethren.
The flag of Wii has attracted the largest army. However, it's soldiers know nothing of war, how to be a soldier, and sometimes don't bother showing up to the war at all. They are busy using their toylike weapons to play tennis, hang out on islands etc.
The PC warriors are too busy seeding out penguin-dressed infiltrators and winging about rotten fruit to do any good in the war. As a paramilitary group of Fhurer Gates, they will only be called into the war if the Green Flag starts to falter.