Well, I believe the Emperor is out of the question, since he's the most OP character in StarWars after EU Palp.
As for Malgus.. they way I see their fight would look like: Jadus would continuesly force-lightning Malgus, while he, raging like a rabid tauntaun, would slowly walk towards Jadus intending to smash his mask in to his face with his bare hands.
Cuz that's how warriors roll.