Using Legends canon (primarily to evaluate the gap between Vader and Sidious, and Vader and Dooku):
Zonakin overwhelms Dooku more quickly than Luke overwhelms Vader. If we just observe the fight, Dooku seems to at least be capable of putting up some semblance of a fight (although Stover's novel makes it clear that he is getting humiliating), while Vader can barely stand properly against Luke's Force power. However, Anakin still seems to be in better control of his power than Luke, who is basically going full uncontrolled rage! mode.
I'd say Rage! Luke is more powerful than Anakin, given that his Force valor outclasses Vader's more than Anakin's outclasses Dooku's and Vader is more stronger in the Force than Dooku. Anakin seems to be the more concentrated and coherent swordsman. Seeing as how the aggregate outcome is Anakin winning more quickly against someone who is IMO a superior swordsman to Vader, he probably takes it.
Maul ultimately loses his fight against Sidious, having his guard broken even before Sidious ragdolls him. So it really depends on how Sidious would fare against Zonakin. He dominates pre-vaapad Windu, I'm not sure if he does so to a greater extent than Zonakin dominates Dooku.