User blog comment:Lord Zeref Dragneel/Top 25 most powerful characters/@comment-25111584-20150812160455/@comment-1153699-20150814101036

Godisme -> The 3 months before the GMG and this past year aside, we pretty much know Mira didn't do any training or took missions. We know she was a full-time bartender. Did she show any interest in training / catching up / getting stronger at all? No.

There's no evidence that suggests Mira trained besides these two time periods (while there is evidence that suggests she didn't). Personally, I can't put someone like Mira (who has shown no real interest in getting stronger) on the same level as someone like Erza (who takes missions and stays active).

We already saw the difference in power between them during Tartaros arc. Erza was interrogated, fought Kyouka (second strongest 9DG) for a while, beat Neo Minerva, and then held her own against EF Kyouka without her 5 senses. Mira on the other hand, could only stalemate Base Sayla with BSS and her strongest from (Sitri) got one-shotted by an unnamed attack from LR Sayla. Erza performed a lot better compared to Mira. That much is obvious.

And I don't even like Erza. I dunno about you guys but I can't just deny things that happened in the Manga when discussing who's stronger. :/