Until "Rebels" wont show Kenobi as far stronger Force user then he was in TCW/ROTS, I'll pick Dooku as a winner.
Vader doesn't has anything, besides paper's showings. He's great until he has to fight in a duel.
He couldn't defeat Starkiller with his TK, couln't beat Kenobi with TK, he couldn't beat Ahsoka with TK... even Dark Woman and some other fodder Jedi.
Unlike Vader, I believe that Palpatine could stomp Marek with his TK (as it was shown in DS ending), Dooku could stomp Kenobi, Ventress.
And Vader will be in disadvantage against lighning.