There's a big difference between winner from a business perspective: Wii (most sales, by far greatest revenue)
from a enthusiast perspective: Best games, best online ecosytem, best 3rd party support (360 or PS3)
and from a casual consumer perspective: System I have in my living room for when friends come over: Wii/Kinect
There's no arguing on this site (a sales chart site) that Wii is this generations winner but what's on paper and what's in the hearts of gamers is a different matter. Clearly this is usually one and the same but not this gen or at least, not at this point in this gen.