Everybody will have a different view on which is the 'best' console. Everyone has different needs/tastes.
I'll be honest, the Wii gets more use than other consoles in our house, purely because its inclusive fun, not antisocial. Everyone joins in, everyone ends up rolling around the floor laughing. This is where Nintendo have found their current niche. If I'm honest, the games that come out most are the Sports and Sports Resort games, and of course Mario Kart. Mrs TB likes the Wii Fit series, and the dance ones as well.
Our seXBOX actually gets the most use, but can't remember the last time it actually had a game disk inserted - its primary role for me is a MCE extender. The games it has, to be honest, like the gayStation, are antisocial. It would appear I have too many friends, too many hobbies, too many commitments and not enough time to sit around like a teenager for hours each night to scratch the surface of these games.
gayStation has nothing I would use. Like the seXBOX360, the games aren't for me. I have an MCE for playing films, and won't buy a Bluray player until Sony actually standardise the format, and to be honest would probably just upgrade the MCE instead.
So for me, I would say the Wii is the 'best' console for games, bizarre as that might sound
