Quoted from Squeakman:Iron Maiden just looks too much like a mashup of TZ, Congo and Metallica. I did enjoy playing it, but honestly don't see what makes it so special. And I am a huge Iron Maiden fan.
A mashup of Twilight Zone, Congo, and Metallica sounds amazing. Having said that I'd still probably go with Attack From Mars. It's been on the top of pinball rankings for over 20 years. I find the layout on Iron Maiden to be more unique, but in a single machine collection that doesn't really matter. Either way though, don't be set on keeping a machine forever. Buy something, enjoy it, and then let it go to purchase something new.
PS: I don't totally disagree with you. Back when it was Archer, I suggested for that a complete upper loop shot play piano music as a tribute to Twilight Zone. I've sketched out my dream layout many times and it includes that exact same shot. I always though of my machine as a cross between Twilight Zone and Attack From Mars.