Alright im probably gonna get a lot of shit for this but screw it!
Sabers. Kun is a master of lightsaber combat and specialized in the Niman form mastering it to its fullest extent, he defeated many opponents from his own master as a padawan to various others, with the only other person being able to match his prowess is Ulic Qel Droma. Meetra is a former jedi general who specialized in both field combat and tactics, she was a practitioner of Soresu, Makashi, Shii-Cho and Juyo(because of Atris) Meetra while not regarded as a master of combat has defeated many powerful and notable opponents such as the jedi Master Atris, Darth Nihilius, Darth Sion who served under Kuns order and Kreia who was a quote "Master Of Lightsaber Combat. and While Kun obviously take this section, we should note
that Meetra can quite literally mimic virtually anyone's form and apply it with expert to master level precision as shown with the various quotes the masters and Kreia throw at the Exile.
Verdict on Saber. I can safely say that Kun has this area in the palm of his hand but Meetra isn't that far behind as she might surprise him by using his own form against him.
Force Powers. After her connection with the force was reestablished, Meetra became increasingly powerful, using powerful techniques like Force Whirlwind, Force Resistance, Force Valor, Force Speed, force heal, mind Trick and because of her tutelage under Kreia, She learned ancient and powerful abilities like Breath Control and Beast Control and even unlocked the extremely rare battle meditation and Force Enlightenment abilities, which pushed force powers like Force Speed, Force Resistance and Force Valor to their fullest extent/highest level of mastery. Kun has shown himself to be capable of using powerful force pushes(and force blasts with his gauntlets) and has shown to a very skilled alchemist, he has also shown himself to be able to lift an entire person with barely any strain.
Verdict On Force Powers. Though Kun is obviously powerful, Meetra has a greater pool of force powers adding to her overall versatility in force combat, her tutelage under Kreia earned her much knowledge of force powers among many things and because of that she was a much more well versed force user as Koon was much more of a duelist than a Force user like say The Barsen'thor Or Revan.
Verdict. Because Kun is much more of a Lightsaber duelist, I firmly believe he will initially overwhelm Meetra during the start of their duel, however, the minute this happens Meetra will immediately use begin to mimic Kun and use his own form against him. Honestly Her force enlightenment ability along with her mimicking skill will both play a HUGE part in the battle with Kun with Meetra having to rely quite heavily on both of them in order to beat Kun. My vote goes to Meetra, Her mimicking ability along with her rare ability are the main driving force of this fight, similar to Kun's gauntlets being the driving force behind any of his victories. Honestly a lot of Kun's fans put him near Bane or even Sidious, however many tend to forget that many of Kun's victories are usually attributed to his surprising everyone with his Saberstaff which up until then hadn't even been invented, however during the jedi civil war and the first great purge saberstaffs were quite common, which would in no way affect Meetra, though I obviously will say that none of the saberstaff users of her time were masters of it - at least not to my knowledge. though you cannot deny that most of Kun's victories were a mix of skill and surprise similar to Grevious' first encounter with the Jedi.
Let the shit storm begins....