What kind of guitar hero game has the hardest rock music?

Every guitar hero game has some hard rock tracks mixed in. Like Guitar hero world tour has system of a down,Korn,Metallica to name a few.  There are also tracks you can download for each guitar hero like guitar hero world tour has plenty of Metallica tracks you can download to use in the game.I remember playing guitar hero 2 at a friends house and I enjoyed playing a song by shadows fall But you have to unlock that track. So every guitar hero provides hard rock but there is also guitar hero legends of rock that has hard rock bands like slipknot but also has other rock bands that aren't hard like the comical tenacious D. You can also get guitar hero Metallica that has Metallica tracks as well as tracks by other artists here is a list of the tracks on guitar hero Metallica
By Metallica

"All Nightmare Long"
"Battery"
"Broken Beat & Scarred"
"Creeping Death"
"Cyanide"
"Disposable Heroes"
"Dyers Eve"
"Enter Sandman"
"Fade To Black"
"Fight Fire With Fire"
"For Whom The Bell Tolls"
"Frantic"
"Fuel"
"Hit The Lights"
"King Nothing"
"Master of Puppets"
"Mercyful Fate" (Medley)
"My Apocalypse"
"No Leaf Clover"
"Nothing Else Matters"
"One"
"Orion"
"Sad But True"
"Seek & Destroy"
"The Memory Remains"
"The Shortest Straw"
"The Thing That Should Not Be"
"The Unforgiven"
"Welcome Home (Sanitarium)"
"Wherever I May Roam"
"Whiplash"

Other Artists

"No Excuses" by Alice In Chains
"Turn The Page" by Bob Seger
"Albatross" by Corrosion of Conformity
"Am I Evil?" by Diamond Head
"Stacked Actors" by Foo Fighters
"Hell Bent For Leather" by Judas Priest
"Demon Cleaner" by Kyuss
"Tuesdays Gone" by Lynyrd Skynyrd
"Beautiful Mourning" by Machine Head
"Blood And Thunder" by Mastodon
"Evil" by Mercyful Fate
"Armed and Ready" by Michael Schenker Group
"Ace of Spades" by Motorhead
"Stone Cold Crazy" by Queen
"Mother of Mercy" by Samhain
"War Ensemble" by Slayer
"Mommy's Little Monster" by Social Distortion
"War Inside My Head" by Suicidal Tendencies
"Toxicity" by System of a Down
"Black River" by The Sword
"The Boys Are Back in Town" by Thin Lizzy

So I guess the best bet would be guitar hero Metallica and second best would be Legends of rock.