Iron Maiden vs. Iced Earth
Sepultura vs. Megadeth
Pantera vs. Dream Theater
Judas Priest vs. Helloween
Black Sabbath vs. In Flames
Slayer vs. Ozzy Osbourne
Metallica vs. Emperor
Motörhead vs. Anthrax
The only two hard picks were Slayer and Motorhead. I actually prefer Ozzy and Anthrax, but I know the other two mean more to the metal world.