Currently, Guitar Hero only allows 2 people to play together with guitar instruments. Rock Band allows upto 4 people to play together with 2 guitars, a drum and a singer which is the probable reason why some players would prefer it over Guitar Hero. This will change when GH4 is released later this year as it will allow the same number of players and instruments to be used together.
Rock Band is also much more expensive than buying current Guitar Hero games.
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Currently, Guitar Hero only allows 2 people to play together with guitar instruments. Rock Band allows upto 4 people to play together with 2 guitars, a drum and a singer which is the probable reason why some players would prefer it over Guitar Hero. This will change when GH4 is released later this year as it will allow the same number of players and instruments to be used together.
Rock Band is also much more expensive than buying current Guitar Hero games.