User blog comment:Leek0421/The strongest Female Fairy Tail wizard/@comment-25693405-20150513020410

I don't think it's that simple to see who wins, it would depend on the circumstances. Juvia has the equivalent of the pokemon ability "Rain Dish", as seen during the Eclipse Celestial Spirits Ark (although I have no idea if that's supposed to be canon), so she gets an advantage in the rain. (I'm just using this as an example to show that it's circumstantial)