Quinlan_Vos
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This is an interesting duel.
Anakin: ROTS Anakin is a master of Form V Shien. He is incredibly quick and strong with the lightsaber. He doesn't use much Force abilities in combat, instead relying on his saber. However, ROTS Anakin is very overconfident of his skills (this is shown by how Dooku cut off his hand and how Obi-Wan sliced his body in half on Mustafar).
Vader: Vader is master of a Form V variant, Djem So. He is also skilled in Makashi and Soresu. He uses the Force more often than Anakin, with abilities like Force Choke, Force throw, Lightsaber throw, etc. In addition, his armor protects to an extent: lightsaber thrusts. However, he is much more slower and can't jump in the air (at least he doesn't want to, remembering Mustafar 🙂. In addition, Vader has a more calm mind in due to his loss to Obi-wan, therefore he won't get overconfident. Finally, Vader was a Jedi hunter during the two decades from ROTS to THN.
Winner: Anakin will go straight at him with Shien slices. Vader will use Makashi and throw objects with the other (like the ESB duel with Luke). So Anakin has to slice those objects while blocking Vader. Personally, it could go any way. Either Anakin gets tired and makes a mistake. OR Vader cannot fend off the quickness of Anakin and loses.
Personally, I go with Vader for experience wise in killing Jedi. But Anakin can win. You guys decide.