User blog comment:SethHeartphilia/Whos stronger Erza or Mirajane/@comment-1153699-20150701011432/@comment-1153699-20150712091918

If Mirajane continued to stay active and go out on missions after Lisanna disappeared, she would've probably stayed in Erza's lvl, but I don't see her being stronger considering how much Hiro wanks Erza. Still irrelevant though because I'm comparing Mira's and Erza's powers as they are right now..

Whether Mira has potential or not doesn't really matter when comparing the two as they are right now. Romeo shows a lot of potential as well. Having potential isn't a thing that helps you win/having the advantage in fights. Offense, Defense, Endurance, Durability, Mobility, Reflexes, Agility, CQC etc are. And Erza is clearly superior to Mira in most (if not all) categories.

Again, Mira taking over other powerful demons/curses is irrelevant when comparing Tenrou/GMG/Current Mira and Tenrou/GMG/Current Erza. The same can be said about Erza and her Armors, anyway..

Erza relies on raw power even more. She has a spell that lets her put all her Magic Power into one single sword. :p