On the strength of Nadd. Ommin, a dude who was dominating the population of Onderon and poisoning its atmosphere with the dark side of the force, possessed a portion of Spirit Nadd's power. I'd wager peak physical Nadd could be able to potentially defeat either of his combatants, whilst Muur could match them. Or maybe not.
@Sunrazer
....Ok? Nadd and Muur are infinitely more skilled than Traya and The Exile, the latter of whom can master lightsaber forms through mere observation, and the former of whom was apparently the latter's equal, as far as battle is concerned. I'd wager they're skilled enough to at least hold their own, and in Muur's case, power is definitely enough to get you a win anyways.