User blog comment:SethHeartphilia/Whos stronger Erza or Mirajane/@comment-107.140.74.140-20150329044210/@comment-26156772-20150608140714

Each time Erza wins a fight, it's because of her determination. She refuses to loose a fight. She always has a near death experience but gets up very slowly and talks about "the power to protect her comrades, blah blah blah, She'll fight for them, blah blah blah, there's no point in living if you can't protect those you love, etc,..." After that she equips into one of the 2 out of 100 armors she has left and wins the fight, yay. It's really boring because that's what all of her fights are like.

Mira just gets angry, transforms into Satan Soul, kicks her opponent's butt, without a single scratch on her body. With even close to Erza's stamina she would beat every character in the series except Zeref, they'd be tied.