Guitar hero or rock band?

I've been dying to play guitar hero for months cause I haven't played that nor rock band for a year or 2 but now I can't decide if I should get guitar hero world tour or rock band 2. Which one has the best songs for a rock fan that likes bands like avenged sevenfold, queen, lynard skynard and the rolling stones. Also which would be provided at best prices with accessories at gamestop or amazon. I'm not asking you to fully research this just asking for the people that know some of these things. Thanks in advance.