Board Thread:General Discussion/@comment-24942479-20170607070523/@comment-25491743-20170611221745

I'd say Cora for the reasons everyone's mentioned. Regina was tutored by Rumple for longer, but Cora's had more experience in magic + just because Rumple stopped tutoring her, doesn't mean she stopped learning (she had a spellbook of Maleficent's in her belongings).

And I know this is a minor thing, but when Regina and Zelena  were threatning to fireball each other (in "Sisters") she got rid of both their flames with a wave of her hand.