Naga Sadow vs Count Dooku

All-out

Count Dooku stomps.

Many sub-Dooku Sith/Jedi could beat Sadow

Dooku. Sadow didn't show anything impressive in TOTJ only thing I can think of that he has solid scaling from is Kun when he just got his amulet. He can also kill an army of Ingelligent Massassi but considering he had the OP amulet of his that isn't too surprising. 

He also might have an equivalent to the Gauntlet of Kressh, which if so could sway a victory to him but I'm uncertain. Kressh didn't display anything like that in regards to his own personal being.

Dooku

ngl, im proud nobody said sadow. sadow wank can be hard on CV sometimes. tough shit.