As always, none stands to Luke, but all 3 of his opponents are too powerful to be steamrolled either.
Figure Luke fights Sidious, and while he'll win, (And it's certainly easier then DE Sidious) it'll take some time.
Figure Yoda fights Caedus. Caedus is fighting a 'losing draw' here, about in the same position Yoda found himself in fighting Sidious. Caedus holds up REMARKABLY well, to be sure, but Yoda will drive him back.
Vitiate will take Plagueis down eventually, though Plagueis is no fodder and should hold up for a while.
Yoda vs. Caedus will finish last, as the margin is narrowest there.
So can Luke finish mid tier Sidious faster then Vitiate can finish Plagueis? The fight more or less depends on that answer.