I am going for Piece of Mind to The-X Factor because:
5 of these albums (Powerslave, Somewhere in Time, SSOASS, No Prayer (the best four album string for me) & The X-Factor) are better than all other albums. Basically, these are my 5 favourite albums. The other two are no weak albums for me:
- Piece of Mind I rate higher than some albums of the current line-up, higher than Virtual XI, higher than Beast, higher than Killers, and about as strong as the debut album.
- Fear of the Dark I rate higher than Virtual XI and Dance of Death, and lately I find it at least as good as The Final Frontier (which has dropped in the last years). Sometimes I also find it at least as good as The Number of the Beast.