Not gonna lie, I got the two versions mixed up too. Rather than a confusing abbreviation, I'd just simply use their release years, i.e. Clone Wars 2003 and (The) Clone Wars 2008. But that's just me.
Dooku
Grievous, my vote
Asajj Ventress
Durge
Alto Stratus - TBD
Sora Bulq - TBD
I'll go ahead and say that the latter two are mostly unknown to me. Dooku is still among my favorites, but I did give Grievous my vote. In some ways it was a "pity" vote for the aforementioned confusion since people really dislike the 2008 Grievous, whereas I'm fine with both versions. Of course, between the two versions, 2003 Grievous was far more deadly and that first scene at the end of "Chapter 20" was just pure gold...though I'll ignore that he was voiced by John DiMaggio, who I like as a voice actor but couldn't imagine as Grievous.