Naga Sadow was said to be capable of defeating an army of Massassi, who in return defeated armies of other Massassi, but I'm not sure if that's due to skill with his sword or Force powers.
Naga Sadow was also praised to be the embodiment of the Sith Marauder during the time of Galactic War and stalemated Ludo Kressh (which isn't as impressive as stalemating Exar Kun).
Droma's a more impressive combatant, seems to have defense against sorcery, and has an OP Force Barrier that should handle anything else Sadow might throw at him. He should win, IMO.
Sadow was regarded to have immense power in Sith Sorcery and delved into ancuent Sith rituals and jazz, and was able to "identify where the enemy was weakest and strike with devastating effect." The illusions he created were so potent his enemies couldn't tell if the were real or not. He didn't need his maditation sphere to use the power, its only amp was to use it at such great distances and such a large degree. He could easily confuse and overwhelm Qel Droma and end him quite effortlessly.
Originally posted by Tondemonai
Sadow takes it easily. His mastery of the Force and the fact he was the Dark Lord during an age of the greatest swordsman in galactic history speaks more than enough.
What makes you place that age as one of the greatest swordsbeings?
I place it the opposite- most sith we've seen from that time are much more force based. Naga and Ragnos and so on, they mostly emphasize their sword play. Heck, in Kun's time, Kun and Ulic kinda stood out for their sword play while many Jedi used less direct force powers.
CW was probably the height of swordplay, because they focused on that.