Great choice on Caught Somewhere In Time and The Duellists AlexanderTheMariner! Those are definitely two of my favorite Maiden songs and Bruce performances. I REALLY wish they would perform both of those songs on The Book Of Souls tour!!! They really need to perform something besides Wasted Years and Heaven Can Wait from one of their greatest albums. I don't get why so many Maiden fans dislike The Duellists. It's not their greatest song, but it definitely has a good vocal performance and has some pretty great guitar in it (as does every song on Powerslave).
It's pretty hard for me to narrow down all of my favorites, but I'll try to narrow it down to 10. I don't exactly rank vocal performances by range or anything, just how much I enjoy the vocals for the specific song.
Albums: Somewhere In Time, Powerslave, The Number Of The Beast.
Songs: The Number Of The Beast, Hallowed Be The Name, The Duellists, Rime Of The Ancient Mariner, Caught Somewhere In Time, Alexander The Great, Infinite Dreams, Seventh Son Of A Seventh Son, The Legacy, Coming Home, If Eternity Should Fail, Empire Of The Clouds (I don't really feel like coming back to update my list after September 4)
. I also really like his performance on Mother Russia.