User blog comment:Mohamed7845/Dion/Kira Who is Better/@comment-26575441-20150915021857

LS: Depends on which dungeon you're using them for.

Sub unit: Dion wins as an offensive unit, with 200% being the highest BB damage buff not on UBB. ATK down if helpful in many GGCs, but not necessary. Basically, use dion if you need BB damage boost and Kira if you want ATK down.

UBB: Dion provides a 130% additional Spark damage up... that's it. Kira on the other hand provides a 200% boost to ATK and boosts crit rate to max. There are plenty of better offensive UBBs though.

Kira wins for having a better UBB. :P