GM vs GM.
Think on that fight classes that can reduce enemy's P/M.defense the most would win, I mean if Veno
chain bomb both Myriad which magically both proc Mind/Armor Break. Or basic Spark mage. Not sure if GM's have accuracy anywhere so that might make phys class in disadvantage.
For GM char I would say Veno is strongest (Sage is kinda good for Degen while Demon has Nova).