Magneto and Professor X vs Darth Vader and Sith Lord
Young Magneto and Young Professor X was transported to Star Wars Universe. Yoda has asked help to battle Lord Sith and Darth Vader. They accept and are in disguise as the new Jedi breed. Who wins?
When yous say Lord Sith, I assume you mean Lord Sidious.
The mutants stomp. If Magneto doesn't just yank away their sabers and kill them with them, or kill Vader with his own body, Xavier can just mindrape them.
If Sith Lord refers to Darth Sidious, then he's got this. Vader's use depends on whether his armor is ferromagnetic or not. If it is not ferromagnetic, he'll pull his weight.
Xavier won't be mindraping anyone, as telepathic attacks are a Sith Standard and both Jedi and Sith have defense against it.
Sidious will easily speedblitz Xavier, who's in a wheelchair, for crying out loud, and might well speedblitz Magneto too.
Vader can stand there and look menacing while Sidious handles it, really.
Lightsaber hilts are not ferromagnetic. Lord Sidious specifically notes his has an electrum finish. Electrum...not ferromagnetic.
If you don't believe it is, it's up to you to prove that in the movies with Vader, his armor isn't magnetic.
Telepathic attacks are not a Sith standard. The most we see is the Jedi mind trick which only works on the weak willed, and Sidious clouding his movements from Yoda. Xavier directly manipulates your mind and has frozen people in time for extended periods.
Speedblitz is a possibility, but it's a much lower possibility than Magneto just smashing him with everything metal in a 10 miles radius while Xavier keeps them in place. Because no one in Star Wars has shown the ability to resist telepathy on that level.
Okay, what is stopping Vader and Sidious from opening with a Force push and lightning attack before the mutants have time to react? They're much faster and both utilize Force attacks.
Oh, to the contrary. Darth Sidious's essence transfer is a telepathic attack of the highest order, as he essentially jumps into someone else's body, overcomes their will, and grand theft me.