Suggested by Sonic Kirito and Roy are both very powerful swordsmen who know how to use elements within their swordsmanship. Kirito ultimately takes this one though as the guy just continues to get stronger and stronger with each arc. Alicization really brought this to the peak when he mastered aura usage and gained his powerful super form. In this mode it’s fair to say that he is barely even human anymore. Roy has had some really good speed feats in his day as well but at this point they are in different leagues. Kirito wins.