Iron Maiden hands down will not become so repetitive in nature and easier to maintain. Plus holds value much better than DI. Pinball browser allows changing of any music if Maiden gets on your nerves. The great table layout is way more kinetic in its shots and makes up for music.
DI is okay, but becomes rinse repeat one too many times. Quite a simple game, very linear in game play and the left side loses the ball, with a clunky Bob orbit. Playing at my friends, we move onto Maiden over DI all the time. Also (and this is big), it is a maintence challenge much of the time, from what my friends tell me. The hood is up as much as the glass is on. Lol