Which one is better : Guitar Hero II or Guitar Hero III. I need to know

I enjoy Guitar Hero 2 alot more, probably because I'm used to all the songs. GH3 has a great tracklist though, and there is online. If I were you I would look at the tracklists and see which one you like. Then also take into consideration what kind of guiter you want. Do you want the wireless or the wired. Whichever one you buy, you should still buy theotherone, either the full bundle so you can have two guitars, or just the game without the guitar.

GH2.

Funner songs, more challenging. I've played GH2 for almost over a year. I was sick of GH3 in about 4 days.