I have never played a PS3, but I don't like the security on it..it sucks.
But for the Wii, and the Xbox 360 it depends if I want to slice someone if half with my hands yay Wii really fun system because it gets you involved in the game. And in some games it's a workout :P
But I like the xbox 360 overall. But I'm beginning to hate Microsoft, they're being real asses when it comes to anything.
I'd rather the Wii because it makes you move your body more, making it an exercising game console. One of its biggest exercise sellers in Wii Fit which im getting soon. It also has lots of other games that make you move.
I have all three of the systems. I play the 360 the most followed by teh Wii than the PS3 now I am not saying either system is better than the other they all have good points (thats the reason I bought all 3) But they all have different strengths and weaknesses neither system is out right better or worse.
I favor the xbox 360. the wii is definitely fun, but it lacks the more complex games that I like on the xbox, which isn't to say the wii has none, The xbox just has my favorite games of this type. The ps3 also has good games, but its expensive, and I stil prefer the games for the xbox.