User blog comment:Mohamed7845/Rinon/Kanon Who is Better/@comment-26926725-20150826135150

Rinon becuase she has much more utility than Kanon. It's true that Rinon doesnt have the DEF buff in ther BB, SBB, or UBB, but thats all that Kanon does other than his LS. Rinon's BB and SBB removes status ailments, like Kanon, but she also negates them for 3 turns. That's better than Kanon because you can still get status ailments after using Kanon's BB or SBB.

Rinon also has the "adds Light and Dark element to attack for 3 turns" effect that Kanon doesnt have.

Another main point is that Rinon actually heals while Kanon only boosts DEF. Healing is more useful in tight situations (my opinion, you might think DEF is better, I do in some situations).

TLDR: All in all, Kanon is more of a DEF oriented unit and that's all he does. Rinon is a healer/multi role support and is generally more useful.

I'd say RINON.