After 30 years of seeing them live, I do not think I have any real favourites that I have yet to see them play. It would be nice to see Infinite Dreams, but like
@Ascendingthethrone, I cannot really justify to spend a huge amount of money to go to Eddfest just to tick that one off the list of songs I have not seen live.
I cannot really complain. I have seen all my favourite Maiden songs live. If someone would have told me in 1998 that we would have a long and successful reunion in which the band would be playing live songs that had not been played since the mid-80s, I would have thought they were pulling my leg. The Prisoner, Children of the Damned, Revelations, Flight of Icarus and Powerslave are the highlights to me.