Barsen'thor.
Whilst he lacks the lightsaber mastery Kenobi has, he has the advantage that Kenobi is a defensive tactician. Kenobi cannot press his lone advantage, because if he does go aggressive he loses the edge in skill because his Ataru is not nearly as refined as his Soresu.
On the other hand the Barsen'thor's Force advantage is for kbvious reasons going to be very effective in this contest.