Metallica

Personally I think the black album was the only one that was really that good, so in a way, I'd have to say old Metallica. But only for the black album!

I can't say, Metallica is good either way, so I'll just have to go with both since all the songs of Metallica are good and I don't think people would disagree with me, but if they did I wouldn't really care because this is just my opinion, aha! If you have a different opinion then I'm fine with that too.