Quoted from Lermods:both are great games, can't go wrong with either. IM is much more brutal and doesn't have the same flow as Xmen, but it is a great game. Xmen code is much deeper. I'd go with Xmen first and then get an IM down the road. I prefer Xmen pro because I don't like the moving ramp (blocks upper flipper and feels clunky to me) and I don't like the night crawler pop ups (they aren't like the trolls in MM). In a small collection, Xmen will be a better choice.
U can disable the ramp and pop ups.....