Both.
Huge Priest fan, found out a band called Iron Maiden was opening on the Point of Entry tour, so I went and bought their new album called "Killers" was blown away.
Have to give Maiden he nod though, much better musically, Harris is the Bass King of Metal!
Saw "The Beast / Screaming" tour after that one, mind blowing.
The "Killers / Entry" tour I saw 7th row in a tiny Orpheum Theatre (DiAnno, etc) amazing.
Saw them each around 7 times, faves still to this day.