User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 42: June 2015/@comment-25395791-20150703044100/@comment-3290324-20150703062404

Wow, slow down there peeps. Imo Juvia would definitely win, but don't be so quick to underestimate Cana. Especially when Mashima himself said that she was either the third or the fourth strongest female in the guild. The fact that he didn't say which should tell you something. She may not be stronger than Juvia (I certainly don't think she is), but she would troll Lisanna with no trouble at all. She has way more Magic Power, skill, and experience than Lisanna.