another thing to note is the aeroplane heaven spit is the mark 1b with 3 blade prop so its first gen spitfires whereas the flying iron is probably the definitive mark in the mark 9 and would have slight differences in cockpit to the mk 1 whereas i dont know which mark A2A are doing but for pure popularity i would guess at the mark 5 which is the missing mainstream spit which would have a lot of colour scheme options and perform differently enough to both other marks in or coming to sim