well i just received some information about Kyle Katarn so i believe i could make a valid judgement. actually no but i still think it would be a decent conclusion. i think Quinlon Vos would win only because i think his assassin techniques would prevail over Katarn's traditional fighting tactics. But as i said before i am not an expert on either character so don't get mad if my reasoning is way off. 😮
Okay, I am going to specify on this fight a little more:
It is Kyle from right after the events of Jedi Outcast, and Quin from the current issues of Star Wars Republic. They both have experience with Dark and Light sides of the Force and are pretty evenly matched. This battle is without the Valley of the Jedi. The setting is: The busy streets of Nar Shadaa.