User blog comment:Water Dragon Slayer/Chapter 348 - The Demon's Back/@comment-33019320-20130823091518/@comment-33019320-20130823100810

I don't mind having the three Dragon Slayers in Fairy Tail as although they have variations of the same magic, they're unique in their own way.

Celestial Spirit Mages however pretty much summon spirits. The only variation is the type of spirit summoned.