For me I love Pyromania because my first taste of Def Leppard was with Pyromania when I was 13 and during the Mtv Video music revolution. However to many who didn't have Mtv back then or were too young in 1983 or more influenced my the raido, as Pyromania didn't have the huge hits Heysteria did, they lean more towards Hysteria. Either way they both remind me of great years of my youth.