User blog comment:Monét/Who is better, Erza or Mirajane?/@comment-74.79.196.18-20140710002627/@comment-220.255.2.147-20140911092336

firstly, demon halphas is not a canon take over, it appeared in a filler arc in the anime. second, even before when mira had her take overs they were relatively on equal ground. thirdly, when they said that halphas destroyed a city, it was referring to the fact that she cannot control the power of demon halphas, which is why she easily loses control and destroys too much. erza also has the power to destroy a city if she wished to, in fact in the first few episodes she along with natsu and gray destroyed a mountain range, and she destroyed an island during the edolas arc. we have not seen what sitri can actually do, since it was a really short battle and she dint actually need to use sitri, but erza recognized it as her strongest take over, and the two of them have dueled in that form together, so she can still match the power of sitri, and now after second origin and the two yrs break, she could probably surpass it too. as for your last point, like i sad erza does possess the said power, she just has more control over her powers than mira and erza does not like to straight out give it her all, which is why her stamina is very good and shes more of a strategist, using her armors to the best advantage. which is why i feel that erza is stronger. there are actually a lot of other points but im kinda tired so im not going to explain. theres the nakagami armor, theres the part with azuma, erza's feat with pandemonium, erza beating minerva etc. looks-wise i prefer erza, but like you said its subjective. :)