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The setting: the execution arena on Geonosis. Both are armed with their lightsabers.

Sidious, he's got lightning, which Vader doesn't have.

Lucas has stated that at this time Vader's only 80% of the Emperor.

80% of the Emperor about what?

Sidious. Vader is still too strongheaded and Sidious can manipulate his feelings.

Sidious. More powerful.

Originally posted by Twilight Janick
80% of the Emperor about what?
He is 80% as strong as Sidious.

Lightsaber skills alone will do.

Originally posted by Twilight Janick
Lightsaber skills alone will do.
Say what?

I am inclined to say that Sids still might win in terms of sabers. While Vader becomes much weaker at lightsaber combat from ROTS to ROTJ, Sids is still probably the same, or maybe a bit weaker. This is due to the fact that Sids hasn't undergone anything, and age is not a factor. And ROTS Sids took on Yoda and tied (even though I would say Yoda could have won had he not fallen), while I think ROTS Anakin would lose to the wise Jedi Master.

Conclusion: Sidious takes it.

There is a book where the Emperor, after Vader disagrees with him, takes a grasp around his neck and prevents him from breathing, taking him to his knees. Palpatine would take this easy.

he only needs the lightning, it tampers with vaders suit, and kills him easily.

Originally posted by Twilight Janick
Lightsaber skills alone will do. Lightsaber skills don't exist. Only midicholorean count explain all wich is basically like the powerlevels. Vader is 80% of Sidious' powerlevel so that will tell you all.

And Darth Vader is a very bad fighter anyway because he didn't learn further after he got teh suit and can't even keep up his arms anymore.

Bull crap, in Dark Lord: the rise of Darth Vader , vader demonstrates some pretty impressive abilities, and if palpatine choked vader to his knees, its because vader let him, Vader could of caved palpys skull in with his fist for Gods sake.

Power levels don't quite explain who is better at lightsaber wielding than others.

Originally posted by Darth243
Bull crap, in Dark Lord: the rise of Darth Vader , vader demonstrates some pretty impressive abilities, and if palpatine choked vader to his knees, its because vader let him, Vader could of caved palpys skull in with his fist for Gods sake.
Palpy gets stronger, while Vader gets weaker.

Why Palpatine didn't fight in ROTJ?

Cause he didn't feel like it. He wanted luke to face his father, which could turn him to the dark side.

Originally posted by kamikz
There is a book where the Emperor, after Vader disagrees with him, takes a grasp around his neck and prevents him from breathing, taking him to his knees. Palpatine would take this easy. wat book? Shadows of the Empire?

Ugh. Lucas said that Vader is only 80% as powerful as Sidious. That means Sidious would win. No contest here.

Originally posted by Twilight Janick
Power levels don't quite explain who is better at lightsaber wielding than others. Glad you figured that out but Sidious is still an impressive fighter and showed that he stood way above most council members just like Yoda and Mace Windu..

Palpy gets stronger, while Vader gets weaker.

Sure, he lost potential after the lava bath, but he only got stronger since Rise of Darth Vader

And what exactly is the plot of Rise of Darth Vader?

Hunting down Jedi... pretty much.

He actually outmaneuvers two able-bodied Knights quite easily, and he discovers his strength which is enough to break someone's arm in a saberlock.

Palps still killed three Jedi Masters in seconds.. Far more impressive, Palps tools Vader without sweating. GL has said that Vader was not as powerful as Palps, the movies show Vader as the apprentice when the most powerful must rule...

Palps ruled over Vader, Vader was the weaker of the two, he'd die.

Originally posted by Darth Kal-El
wat book? Shadows of the Empire?

where do you get the books from?