for the past 30 years Iron Maiden have beaten Metallica in every single category
Metallica, by a long shot. They have had many more fans over the years and years they've been around, while Slipknot only attracts attention from newer generations.
Well, probably AC/DC because they're more popular.
Iron Maiden.
Iron Maiden
Iron Maiden
Probably Led Zep but there's no way of knowing for sure.
Iron Maiden
Iron Maiden
Iron Maiden
Iron Maiden
Iron Maiden
Iron maiden