I rotate between Piece of Mind and Killers as my faves. Love early Paul D., but Dickinson made Maiden.
He's not alone. I know a lot of people feel that way. With all due respect to Cajun, I have disagree though. While Di'anno's vocals were perfect and I do mean perfect for Iron Maiden and Killers, their sound evolved so much between Killers and Number of the Beast. And because of that, Di'anno's style of vocals was no longer a match to the music. I think Bruce was a much better fit for the musical direction they were going in.
Friend of mine had tickets a few years back so I went. Sounded really good surprisingly but when they played that godawful song almost last of course it sorta ruined it.