It looks like all those extra buttons and cymbals in Guitar Hero: World Tour that will make it better than Rock Band (cause more buttons = more better) don't come cheap. Gamestop is listing the bundle at $189.99 for the Xbox 360 and PS3 ($179 for PS2), $20 more than Rock Band's $169.99 retail price. With tax, that's over $200—meaning music gamers might have to pick between being a hero or a bandleader. Update: At least it looks like quality gear—the Chili Peppers' Chad Smith and Blink's Travis Barker vouch for it in the vid below.
It's already been mentioned, but it's more expensive because the instruments are wireless, not just because there's more buttons.
Where GH:WT will take over rock band is in the music creator.
(For Wii owners, it's a no brainer because RB:Wii came out extremely late and has no online or dlc whatsoever, so most Wii owners already prefer the GH franchise)