I can't really tell you which one would win. The Jedi Council both have said the hero of Tython and Barsen'thor have a very powerful connection to the force, so we know there powerful force wielders. However in terms of lightsaber combat I would say the hero Tython is Probably a better Lightsaber master. When comes to using the force I would same hero of tython is decent, but barsen'thor is A lot better in compare.
Those are in game classes characteristics. Not realy character characteristics.