Then who ever wins fights Luke whats the outcome
Let's make this quick.
It is a fact that Sidious fights faster than Vader can see:
Anakin blinked and rubbed his eyes again. Maybe he was still a bit flash-blind—the Korun Master seemed to be fading in and out of existence, half swallowed by a thickening black haze in which danced a meter-long bar of sunfire. Mace pressed back the darkness with a relentless straight-ahead march; his own blade, that distinctive amethyst blaze that had been the final sight of so many evil beings across the galaxy, made a haze of its own: an oblate sphere of purple fire within which there seemed to be dozens of swords slashing in all directions at once.
The shadow he fought, that blur of speed—could that be Palpatine?
Their blades flared and flashed, crashing together with bursts of fire, weaving nets of killing energy in exchanges so fast that Anakin could not truly see them—but he could feel them in the Force. The Force itself roiled and burst and crashed around them, boiling with power and lightspeed ricochets of lethal intent. And it was darkening.
He could feel the end of this battle approaching, and so could the blur of Sith he faced; in the Force, the shadow had become a pulsar of fear.
--Taken from Revenge of the Sith
It is a fact that Palpatine can destroy worlds with Wormholes, and Vader lacks the ability to defend against such:
It is fact that Palpatine can destroy small armies with Lightning. Vader cannot counter this.
It is also fact that Sidious is the most powerful Sith Lord ever, so this doesn't even need to be discussed:
Yoda went after Palpatine in the empty Senate chamber, but could not defeat the most powerful Sith Lord in history.
--Taken from The New Essential Chronology
Darth Sidious proved to be the grim culmination of a thousand years of Sith philosophy and teachings.
--Taken from Jedi vs Sith: The Essential Guide to the Force
When the Sith finally emerged from a thousand years of watching and waiting, they numbered—in accordance with the tradition set down by Darth Bane—only two. The most powerful of these was Darth Sidious, an ice-cold, diabolically calculating genius equipped with the strength of the dark side of the Force, as well as an enormous wealth of Sith artifacts, equipment, and knowledge.
--Taken from The Dark Side Sourcebook
And then there was Palpatine, of course: he was beyond power. He showed nothing of what might be within. Though seen with the eyes of the dark side itself, Palpatine was an event horizon. Beneath his entirely ordinary surface was absolute, perfect nothingness. Darkness beyond darkness. A black hole of the Force.
--Taken from Revenge of the Sith
Plagueis made a soothing gesture and explained in great detail what had taken place. Concluding, he said, "He threatened, too, to place you out of reach."
All the while Plagueis spoke, Palpatine was storming through circles on the narrow path, shaking his head in anger and balling his fists. "He can't do this!" he snarled. He hasn't the right! I won't allow it!"
Palpatine's fury buffeted Plagueis. Blossoms growing along the sides of the pathway folded in on themselves, and their pollinators began to buzz in agitation. FourDee reacted, as well, wobbling on its feet, as if in the grip of a powerful electromagnet. Had this human truly been born of flesh-and-blood parents? Plagueis asked himself. When, in fact, he seemed sprung from nature itself. Was the Force so strong in him that it had concealed itself?
--Taken from Darth Plagueis
Palpatine has spent decades studying the most arcane and esoteric Jedi disciplines. It is believed that he has mastered nearly all the known powers, previously unknown powers, and devises new ones at his pleasure.
--Taken from the Dark Empire Sourcebook
Of course, there are other ways Palpatine can win this, but again, this is just a quick overview.