Guitar Hero III for me. When it comes to GH3 I don't care about characters and visuals, I just like to jam to my favorite songs. I will admit the multiplayer is not as good as GH2 but I generally don't do that.
I think Rockband is good when you have a ton of friends but it's playing single that I don't like. Bass is just a watered down guitar and I can't play drums and I wouldn't be caught dead singing. The soundtrack is incredibly calm, which doesn't sound as fun or appropriate, versus Guitar Hero's fun adrenaline rush. Don't get me wrong, I like calm music but only at the right times.
I think Rockband is good when you have a ton of friends but it's playing single that I don't like. Bass is just a watered down guitar and I can't play drums and I wouldn't be caught dead singing. The soundtrack is incredibly calm, which doesn't sound as fun or appropriate, versus Guitar Hero's fun adrenaline rush. Don't get me wrong, I like calm music but only at the right times.