that one is more fun, guitar hero or rock band?

I'm thinking of buying one to play with my brother and friend, but we want to know what is worth buying and why? I suggested rock band because not everything can be the guitarist of rock band we can play together instead of always being in competition as in Guitar Hero Am i right? btw I have an xbox360 game that costs more?

rock band. in the rock band, up to four people can play together at once, while that the guitar hero, only two will play. Furthermore, the rock band instruments exist that can play. Rock Band is more expensive because is a drumset, Mike, and guitars.

Guitar Fun Tico Tico