That last part is pretty sweet, as we've seen an increased emphasis on recent mages being specific 'counters' to certain enemy species. He has innate resistance to Fire and Light at 50%, Ailment resists to Paralysis, Confusion, and Petrify, and 200% Innate Killers to Demon and Undead. He's a Dual Wielding mage (these are becoming more common) with a passive to increase the chain modifier cap to 6x when dual wielding.

But overall the attacks and imperils and general rotation are equal. So far as I can tell, he doesn't prefer one element to the other, and will actually use both in the rotation. Mages aside, Kuja is a Quad-Casting Fire and Light-Based mage.

But again from a general gameplay point of view, Mages tend to be lower in overall value because they are locked to whatever element they cast, and CWA frames can be difficult to land for many, in addition to harsher gearing restrictions due to what's available for killers, bulk, etc.

Way stronger than Umbral Dark Fina, who was already really strong. Angel of Death Kuja is a unit that we knew ahead of time from JP was going to be really strong.

Final fantasy brave exvius kuja