User blog comment:Ultrahi/Should i pick a hadaron for Unit of choice or should i pick a Zenia?/@comment-28010479-20160410191629/@comment-26336535-20160411223308

Also, Hadaron has the highest damage output in the game. The only reason other nukers beat him in total damage is the fact that they have AOE. Hadaron has over 100% crit damage buff, potentially 1230% ATK buff from LS, SBB, and Sphere alone, and a weakness damage boost. Even if he's not at 1% health, at half health or lower he has about a 880% ATK buff. Nyami, Avani, and all the other nukers cannot come close to his damage against a single target. He also offers a nice DEF buff, though not the best (but it's pretty close) and a crit chance buff for the team. Nyami offers literally nothing for the team on her SBB except for some hits to spark over, but her LS is much better.

Zenia, on the other hand, is a great spark blanket that gives a lot of damage buffs on both LS and SBB. Her UBB is also extremely useful for Normal Attack OTKO.

Basically, if you have Avani, Nyami, Farzen, Charla or some other Spark buffers/blankets, get Hadaron, since you can already fill up those main roles of Zenia. If you don't have many good spark buffers or BB mod buffers, get Zenia.