Def Jam Rapstar (PS3) vs Rock Band 2 (PS3)

Def Jam Rapstar captures the essence of what Hip Hop is all about: the music, the battles and of course...the swagger.
The ultimate emcee experience for video game consoles, Def Jam Rapstar is the only music game that focuses exclusively on Hip Hop. With more than 40 of the greatest Hip Hop songs available at release, Def Jam Rapstar allows you to be the star: by rhyming, using your console camera, and uploading your video to the fully integrated Def Jam Rapstar community at www.defjamrapstar.com. Def Jam Rapstar also offers you the ability to freestyle over tracks by some of the hottest hip hop producers and upload your freestyle performances for the world to decide how good you really are.

Rock Band 2 is a music video game developed by Harmonix Music Systems, as the sequel to Rock Band. Rock Band 2 allows up to four players to simulate the performance of popular rock music songs by playing with controllers modeled after musical instruments. Players can play the lead guitar, bass guitar, and drums parts to songs with "instrument controllers", as well as sing through a USB microphone. Players are scored on their ability to match scrolling musical "notes" while playing instruments, or by their ability to match the singer's pitch on vocals. Rock Band 2 features improved drum and guitar controllers, while supporting older controllers, as well.