This is a good thread. Mace about = Dooku while Sora pretty much = Asajj. I'd put Mace above Dooku. The OS says Mace = Yoda and Yoda had the upper hand against Dooku. In Obsession Mace and Dooku fight and are pretty much even, I'd say Mace had the upper hand, though, since Dooku fled like he did against Yoda. Dark Rendezvous says Mace and Dooku are equal. Either way the two are about equal but I go with Mace,
Sora vs. Asajj is extremely close. I'm certain Sora'd take most versions of Asajj but this is Obsession Asajj, who's as strong as Anakin or Obi-Wan, and this is only 5 months before ROTS. Sora put up a pretty good fight against Mace when they fought, Sora helped Mace invent Vaapad and all and was a legendary lightsaber instructor. Asajj has more experience fighting Jedi but Sora beat Oppo Rancasis, a Council Member. I'm sure a fight between these 2 would be close, too, but I go with Sora since he had more formal training and was a great Jedi Master before he turned to the Dark Side. Asajj began training as a Jedi but then her master died and she turned into a Sith pet. Sora wasn't Dooku's right hand man for nothing.
So I pick Mace and Sora but it's very, very close.