Guitar Hero Reccommendations

I have been a fan of the Guitar Hero series since it first started, and have loved every game. Recently, I purchased Guitar Hero: DS, and loved it.

However, I've hit a speed bump. I want to purchase a Guitar Hero game for my Wii, but am not sure which one.

So, my question is:

Which Guitar Hero game should I buy?

A) Guitar Hero: Aerosmith

B) Guitar Hero III: Legends of Rock

If you have either, it would be greatly appreciated if you gave me a quick review of the game.