You forget that Altair massacred an army just to kill one guy, and he had to fight that guy, who was a competent swordsman, in single combat without any fancy tricks. And as mentioned before, the prince rarely fought even semi-competent sword fighters, most were grunts who could be killed in a couple hits and didn't know how to use their weapon to block. In AC, even the weak guards knew how to block. Then you have to factor in the Templars. Without his counter attack, Altair has a hell of a time killing them in single combat, yet he still does in the end. Altair all the way.