Expert Demon normal overdrive is a party-wide attack, and raging overdrive gives her a guaranteed double hit, if you can blind her it would be good !

Ultimate Demon normal overdrive is a single-target attack, and raging overdrive is a 2-hit attack that gives her a buff (raise her Atk depending on the HP lost, if I understand correctly). So you should really either deny the raging overdrive, or take a skill to remove buffs (Like Chaos magic, or just take Sol if you got her )