What guitar hero is the best on xbox360?

They are all pretty much the same, it really depends on your personal taste with the music selections of each game!  Best Buy has the Smash Hits selling for $39.99
specifics

• Rock your way through a tracklist composed of 48 songs from Guitar Hero, Guitar Hero II, Guitar Hero Encore: Rocks the 80s and Guitar Hero III: Legends of Rock
• 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
• Create your own signature rocker with the Rock Star Creator, then build your own hits in the Music Studio and share them online with GHTunes
• Take your talents on tour around the globe to favorite locations from previous Guitar Hero games as well as eight new venues, including the Amazon, the polar ice caps and the Grand Canyon
• Find a challenge that suits your skill set with difficulty levels ranging from Beginner to Expert+
• Gather up to three friends for band-style gameplay, then go online to face off against another band in the eight-player Battle of the Bands mode

Walmart has the World Tour with band kit selling for $71.54
specifics
The latest installment from the #1 best-selling video game franchise of 2007, Guitar Hero World Tour transforms music gaming by marrying Guitar Hero's exhilarating guitar gameplay, with a cooperative band experience that combines the most advanced wireless instruments with revolutionary new online and offline gameplay modes. The game will feature a slick newly redesigned guitar, a genuine electronic drum kit and a microphone, as well as an innovative Music Studio music creator that lets players compose, record, edit and share their own rock and roll anthems, along with online Band Career and 8-player "Battle of the Bands." Delivering the largest on-disc set list in a music-rhythm game to-date, Guitar Hero World Tour is comprised entirely of master recordings from some of the greatest classic and modern rock bands of all-time including Van Halen, Linkin Park, The Eagles, Sublime and many more. Additionally, the game will offer significantly more localized downloadable music than ever before on all of the next-generation consoles. Budding rock stars will also be given creative license to fully customize everything from their characters' appearance and instruments to their band's logo and album covers. In addition to a newly designed more responsive guitar controller and microphone, Guitar Hero World Tour will deliver the most realistic drum experience ever in a video game with an authentic electronic drum kit. Featuring three drum pads, two raised cymbals and a bass kick pedal, the drum controller combines larger and quieter, velocity-sensitive drum heads with soft rubber construction to deliver authentic bounce back and is easy to set up, move, break down and store. Guitar Hero World Tour 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. 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, and 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. The game's innovative new Music Studio lets players express their musical creativity by giving them access to a full compliment of tools to create digital music from scratch, utilizing all of the instruments, and then play their compositions in the game. Music creators will also be able to share their recordings with their friends online through GHTunes where other gamers can download their unique compositions and play them.