I'm going for the Wii, no competition. But shoudn't this also include PS3? :P
Anyway. The Wii has delivered a new and unique way of gameplay, unlike the PS3 and XBox 360. Allowing for way more involvment than the other two could deliver.
Most people these days tend to be the "OLOL nintendo sux kid games halo raxxors my boxxxorz and gta wow real looking" kind of "Gamers". The only games I can think of that class under "Kiddy" are Mario and kirby, how much ass did they kick? :P
Nintendo is also making it allow for the gameplay rather than "Realistic" graphics. The point of video games would probably be to get away from the real world for a bit, but realistic graphics fails this objective. A good graphics is all that's needed, and realistic is no good. It can be a "Real" style (GTA, Burnout), but can be unrealistic at the same time (F zero GX, Metroid prime, Halo), as you wouldn't see huge trails of lasers and floating signs in, say, NYC now, would you?
WII!