Hello, people.
I’m considering of buying either Rock Band 2 or Guitar Hero World Tour.

First of all, I would like to know which one is the best choise for vocals, to which I’m particularly interested in. Furthermore, I was wondering if there are any radical differences among the versions of the games in Nintendo Wii and PlayStation 3. Bare in mind that I don’t care about the graphics, they are music games, after all.

I am mostly yearning in Guitar Hero World Tour, since it has a whole album of Oasis available for download. If I download it, will I be able to import the songs I downloaded for it to Guitar Hero 5, if I ever get that one? Is the Wii version the same as the PlayStation 3 one? Any missing songs, features, downloadable content and stuff in either version?

Thanks in advance.