I guess it depends on what you're looking for. Rock Band is better for larger groups of people because it already comes with a guitar, microphone, and drum kit. If you buy another guitar, you can have a lead and a rhythm guitar, or a lead and a bass... whatever. You can do that with GH: World Tour, but I think that only comes with a guitar and you buy the rest. Then again, GH:World Tour is cheaper (depending where you go). So if the price of buying another guitar, drum kit, and mike are equal to or less then Rock Band... Well, it depends on what you are looking for.
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