Darth Revan vs Exar Kun
This is post is a result of the debate. Think of this situation - Exar Kun without the Sith magic, alchamey and amulets. This is raw Dark Side vs Dark Side. Revan by far is a better tactician hands down no doubt. Kun was the 1st to construct the double-bladed lightsaber.
In a raw Dark Side Force battle, it would be difficult to call. Kun would have a slight advantage in lightsaber. However, Revan is a calm and calculated Sith wheras Exar Kun can be somewhat of a loose cannon at times. I'm not saying it would be quick and easy, but Revan ultimately would be victorious. A Sith Lord that has his or her emotions under control would come out victorious.
Opinions anyone?
* by the way . . . Truculent means "merciless temper"