User blog comment:IamJakuhoRaikoben/Chapter 388: Erza vs. Minerva, Review./@comment-133.101.167.124-20140616080800/@comment-5894890-20140617055135

Well we could also consider the fact that she has less weight to carry ... so she's faster/ stronger in a way. BUT I also agree with the armor thing... there's really no point in re-equip magic if your only using one "armor" most of the time.