Yuuki is an excellent swordswoman and a fun character in general. I’d definitely consider her to be one of the better SAO characters. Still, she is up against a particularly talented foe in Raiden. Raiden has complete mastery over lightning and a lot of powerful armors which help her guard against attacks. Her swordsmanship is on the level as well so Yuuki is simply outgunned here. The elemental advantages Raiden possesses will prove to be too much for her. Raiden Mei wins.