The average Jedi Master can beat the average Sith Lord

You make a good point; however I still see several reasons the Sith are the greater power. Now in response to your fight references and Exar Kun remark: yes, Exar Kun is one of the greater Sith Lords of all time but Mace Windu was one of the greats among the Jedi too. You said it yourself, he almost bested Sideous had Anakin not interfered. Sideous however, I think is overrated. His only real accomplishment was he was smart and managed to form a master plan to overtake the Galaxy. Combat wise he wasn't the best and this debate is about who wins in a fight. He also didn't really beat Yoda. Yoda conceded after he had a vision of training Luke and fled even though he really could've won. Therefore, while Sideous was smart and an excellent Sith Lord, he's not one to represent them in the matter if combat. Still, Mace's victory over him was no small feat, nor were any of his multiple other accomplishments and that's why I believe he warrants Exar Kun's place in this debate. That being said, I'll respect your input and take him out after one final note: you said he should be compared to Luke or Yoda. Like Mace Windu vs. Darth Sideous, Exar Kun had Luke beaten, only through the power of some of his greatest pupils saving him was he able to survive. I'm willing to place a fair bet Kun could beat Skywalker one on one with that fact in place. As for Anakin vs Obi-Wan; I think Obi-Wan's victory over Anakin is a little over-credited as well. Yes Anakin was powerful but as I said before, he was nothing but failed potential. During that fight Anakin was still divided within himself and hadn't quite fully accepted the dark side of the force. Thus, he didn't get his true power from it and let's face it; he was an idiot. Obi-Wan was a far more mature Jedi and was superior to Anakin because of the latter's immaturity. Knowledge was the only reason Anakin survived that long. There's one more point I'd like to make regarding Anakin before I move on here, it's clear he was pretty weak among Sith in history. That weak of a Sith Lord marched up to the Jedi temple and killed everyone. Yes he had the 501st, but they could only do so much against the entire temple. He also managed to beat two other great Jedi in Master Cin Drallig and his highly skilled apprentice Serra Keto, Cin could easily be considerd a more than average Jedi master and he was killed by an idiotic Sith amateur. Goes to show the comparasin... Finally, Obi-Wan vs Darth Maul was again Obi-Wan causing stupidity from an immature Sith Lord to be his downfall. Darth Maul had very few things to show for Dark Side force abilities; I can only remember him using 2 force abilities in his entire fight against Qui-Gon and Obi-Wan (push and throwing stuff to open a door). He was simply a meat headed brute with a big stick. The reason he was so easily bested by Obi-Wan yet managed to defeat Qui-Gon was because Qui-Gon had a very saber oriented style of combat, with the exception of meditation that did him little good. Qui-Gon, while strong with this, fell victim to evolution. Maul was a Dathomirian male, it's near impossible to beat one as a human with just your lightsaber. Use the force Qui-Gon! (Pun intended). Obi-Wan was smart enough to use that and look how quickly Darth Maul fell. Once again, Maul was a meathead, not a Sith Lord. My point on Revan still stands, and I'll repeat one of the finer points: he beat an army of troops that Obi-Wan couldn't best when they were ragtag terrorists. As for someone else to take Kun's place, I'll throw in Marka Ragnos. Who else to represent the Sith in combat? Ragnos was a duelist extrodinare, beheading an amazing fighter in Lord Simus and taking control of the Sith Empire. He was unmatched in skills with the lightsaber, and most likely the best in Star Wars up to date. I have no trouble seeing him beating Windu and Obi-Wan in combat because of his sheer skill in dueling. Now we all know saber skills make not the Sith, and Ragnos had not only saber skills to show. In relation to the force he managed to create a scepter capable of quite literally siphoning the force from several places. He also created a pair of gauntlets that augmented the power of the force in their wielder. In parallel, there were many Sith more powerful than he was and yet he still has much more to show than some of the highest level Jedi out there. Finally there's something many people should notice. Sith Empires happen REALLY often and tend to last REALLY long, just look at Darth Vitiate. The Sith when allowed to really tap into the dark side tend to eradicate most things standing in their way, including Jedi on countless occasions. Plus, most of the time the Jedi vastly outnumber the Sith. Therefore, the Sith in history, when compared to other Jedi of equal or greater caliber, seem to come out on top here.