Quoted from Rarehero:GB is the worst game ever made.
GOTG is an OK game with horrible voices.
Get neither. Better games exist.
I agree with @rarehero. Guardians is a very "flat" experience, even with the great work Cleland did w/sound. GB should be the best game ever made with movie assets, a packed Playfield, and awesome theme. But gameplay-wise it's poor.