well lets see. The amulat focuses his power in the force. It makes him a lot stronger (proved by Kun). He killed a powerful jedi knight without the force and only a lightsaber. So he is an amazing lightsaber duelist with awsome force powers. He is better than Anikan or Vader.
ROTS Vader at his peak had fully embraced the dark side and COULDN'T think clearly. This would be like saying "Mike Tyson at the height of his career, but not the undefeated champ versus Evander Holyfield".... impossible to determine. Vader reaches the apex of his power by losing himself to the darkness and NOT thinking clearly. He effectively trades mental clarity for power.
Now, in his defense, Anakin was able to overpower Dooku and surprise him in his anger, but I don't see that happening to Ulic, who is younger, angrier than Dooku ever was, and certainly no stranger to combat. Sith Lord Ulic was very impressive in combat, and could stalemate Kun in sabercombat. I personally don't see Anakin beating him without the most extreme difficulty.
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www.swcomics.com isn't working for my computer right now. All the pages are the little x's in the corner. I'll post later when I can, the only link I have is from before, and it's this one:
And he crushed a room full of medical supplies immediately after he got his suit and had any Sith training, so it's safe to assume that Anakin could do that too.
I'm sure there are more, but I think I've proved my point.
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Okay, all the better. Vader has a huge force advantage over Ulic. There is no evidence to support that he can hang with Anakin as far as force powers go. Vader wins, as far as I'm concerned, unless someone has some links of Ulic doing anything other than being hit in the face with a snowball.