hmmmmmm.... i think my vote goes to Iron maiden, i like iron maiden, its great, but isnt that type of band that i would listen all day, same goes to pantera, im more like a death metal follower. anyway, both are a great metal band and they gave a great contribute to the metal culture, but they arent in the same genre. Pantera, i think its "groove" or neo thrash metal, and iron its heavy metal, if u want a real contest, try vs kreator, sodom, slayer or testament,or another thrash metal band (do not dare to name here craptallica! they dont have the HONOR to call themselves a thrash metal band, the lost it after the 1rst or 2nd cd, because, to my own think, in the metal culture theres is no room for a lame comercial band or, "industrial metal" or "nu metal", that to me, its just the same pathetic crap, xD, METAL GOES AGAINST THAT) ...... continuing with my subject xdd, or try iron maiden against judas priest, deep, black sabbath or even venom, i know they are a black metal band now, but at the beginning they were a heavy metal band. well... something like that... xddd