which guitar hero is the best on the xbox 360?

It really depends on the person but my favorite guitar hero for the Xbox 360 is Guitar Hero Smash Hits. You are going to love rocking out in your room, feeling like a rockstar with any of these games. Have fun, relieve some stress and don't forget the world is your stage! :)

• Guitar Hero Smash Hits:

Get ready to experience some of your favorite tracks from throughout the franchise in a new way. With Guitar Hero Smash Hits, 48 fan favorite tracks come together in one epic game with added gameplay for the drum kit controller and microphone, so you can prove yourself a true master of the musical arts.  Features:

• Show that your talents go beyond guitar mastery with all-new gameplay for the drum kit controller and microphone (peripherals not included).

•  Jam to fan-favorite tracks like Alice in Chains' Them Bones, Poison's Nothin' But a Good Time, Rage Against the Machine's Killing in the Name, Twisted Sister's I Wanna Rock and Heart's Barracuda

Guitar Hero: World Tour for the Xbox 360 delivers more ways to play than ever before. Virtual musicians can live out their rock and roll fantasies by playing either a single instrument or any combination of instruments, in addition to the full band experience.
Game Features

• Play the drums, lead or bass guitar and sing along with new equipment (not included).
• In addition to all of the online gameplay modes from Guitar Hero III: Legends of Rock, Guitar Hero: World Tour introduces Battle of the Bands mode which allows eight players to join online and challenge each other band-to-band to determine who is the best of the best.
• In the Band modes, up to four players can jam together, online or off, as they progress through the game. In single-player Career Mode, players can jam on any of the instruments in branching venue progression enabling them to rock out in the order of their choice.
• Create a Rocker mode lets you customize your own rock star.
• Includes over 85 master tracks from bands such as Tool, System Of A Down, Metallica, the Eagles, Michael Jackson, Sublime and more.
• Download even more music online.