User blog comment:Mamerge/Mirajane vs. Erza, who will win?/@comment-1153699-20140331063443

It's obvious... Erza. They may have been equal when they were younger. But Mira was inactive for about 2.5 years due to Lissanna's "death", while Erza wasn't.

But I think Mira can still give her a hard fight, though.