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[Star Wars] Would Vader really lose in a one on one duel with Sidious?

Off the top of my head the only reason Vader hadn't betrayed Sidious was because his lightning could fry his suit, but would that seriously prove a problem for one of the strongest light saber duelists ever? Especially when we know that blocking lightning with a lightsaber is a relatively simple matter?
gpt
The thing is, Sidious is fast. Like, *insanely* fast. And he knows Vader's fighting style. He knew Vader had tons of schemes and plans behind the scenes of the Empire (as per the comic series *Darth Vader* (2015)) but allowed it because he was (over)confident he could keep his apprentice on a leash. The second Vader enters his room or even the building he's in with the *full* intention of striking his master down, Sidious sniffs him out immediately and acts accordingly. He's always with his Guards, and they were extremely skilled in Legends, so Vader also has to worry about them. The only reason he was able to get the drop on Palpatine in *Return of the Jedi* was because it was not pre-meditated so Sidious had like a second to react, on top of being distracted by his sadism and rage while torturing Luke.