GH3 or Rock Band for Ps3 what should I buy?

Rock Band- Im afraid songs are not that great and the drums and microphone may be a failure. LOOKS AWESOME THOUGH. BUT !!!! $169.99 for set.

GH3- GREAT songs, very fun for me, finally online play, and fun too play with friends. Oh yea only $90

Personally I'm going with Rock Band

1. Made by Harmonix, who made frequency, amplitude, guitar hero 1, and guitar hero 2. All which I own. (Guitar Hero 3 isn't made by Harmonix because Activison bought out the series)

2.Gameplay seems like it would be much morefun with different instruments.

(On a side note: GH3 for the PS3 is 100 dollars, not 90. Only the Wii and PS2 get GH3 for 90)