I've been a big Maiden fan for many a year and I always had my favourite four or five albums, but what I've done here is listened to each album again in the order of their release and given each song a score out of ten and then got the average for each album.
I've also tried to take into account production, artwork and musicianship etc, but ultimately it's the songs that make the album imo.
It's strictly my taste and I know it will differ from some people's choices but hey ho...enjoy!