Exar Kun vs. Darth Vader
Exar Kun in prime corporeal form.
Darth Vader as in Return of The Jedi.
NOTE: Both combatants are fresh and (not) injured or compromised.
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Setting 1: Naboo (Plains)
Setting 2: Korriban (Valley of the Dark Lords)
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Clash types for each setting:-
1. Strictly Lightsaber duel (Martial arts techniques permitted)
2. Force powers
3. All-out
Setting 1:
1.Exar Kun, his form is just far too well balanced for Vader to break with his own form, that primarily being Form V, the chosen form of the day for Kun's era.
2.Exar Kun's offensive powers would eventually win a tough fight, whilst Vader's TK would be effective, it doesn't make up for lacking any kind of counter to Kun's Sith magics.
3.Kun wins a good fight, his ability to render lightsabers inert as well as his Blasts, hax Lightning and his tendrils is way too much an advantage.
Setting 2:
1.The outcome is the same as before, as a nexus amp boons them both.
2.Exar Kun quite frankly stomps. His deathray Blasts would be devastating here.
3.Kun rips him apart because his Force techniques would be far more effective.