Suggested by iKnowledge Both of these two fighters are powerful spellcasters. That being said, Rias can fight more effectively than Zatanna from afar with her disintegration spells. Zatanna has better hand to hand skills so that could help her in a close combat situation but that would be incredibly risky since one hit from Rias would equal death and Rias is also no slouch in the speed department. She’s simply a more balanced all around fighter than Zatanna. Rias Gremory wins.