AncientPower
The Chosen One
Combat feats:
Darth Maul defeats Anoon Bondara before their duel had even begun, despite the Jedi Master being called 'one of the order's best fighters':
The Jedi was obviously a master of the teräs käsi fighting arts, as well, judging by the smooth way he parried and counterattacked. Still, within the first few moments of the engagement, Darth Maul knew that he himself was the superior fighter. He could tell that the Jedi knew it, too, but Maul also knew that it didn’t matter. (Shadow Hunter 76)
Darth Maul engages Jedi Master Qui-Gon Jinn a high tier master of Ataru and is the faster of the two:
His attacker closed with him again, forcing him back, striking at him from every angle. Even without knowing anything else, Qui-Gon knew this man was trained in the fighting arts of a Jedi, a skilled and dangerous adversary. Worse, he was younger, quicker, and stronger than Qui-Gon, and he was gaining ground rapidly. (Episode 1-The Phantom Menace 139)
Darth Maul engages Qui-Gon Jinn & Obi-Wan Kenobi and the Jedi's efforts are described as 'woefully inadequate':
Together, they were able to hold their own against the Sith Lord, but their efforts to attack, at assuming the offensive against this dangerous adversary, were woefully inadequate. Qui-Gon recognized that while it might seem as if the Jedi were driving him before them, it was the Sith Lord who was controlling the struggle. Wheeling and spinning, leaping and somersaulting with astonishing ease, their enemy was taking them with him, drawing them on a place of his own choosing. His agility and dexterity allowed him to keep them both at bay, constantly attacking while at the same time effectively blunting their counterattacks, relentlessly searching for an opening in their defense. (Episode 1-The Phantom Menace 200)
These are just some feats but the apparent ease of which he can defeat high tier Jedi Masters in combat and maintain 'relentless' speed and agility is incredibly impressive. This alone shows he is without a doubt a top tier martial combatant.
Beyond this Darth Maul has defeated Komari Vosa despite a hole through his arm from a blaster.
In off-panel fights he has defeated General Grievous cleanly and held his own against Mace Windu and Aayla Secura by himself.
Speed Feats:
He cuts through a solid wall faster than his opponent's wrist launcher can fire it's missile after ignition:
Desperate, she reached for her wrist launcher. Her only chance was to hit the horned one squarely and hope that the explosion would be contained enough by the other’s body to allow Lihnn to survive. But as she triggered the launcher the tattooed man seemed to disappear in a blur. All of a sudden there was a hole in the wall where an instant ago it had been solid. Too late, Lihnn tried to stop the rocket from firing, but the reactionless motor flared and the missile leapt from her wrist. (Shadow Hunter 55)
Runs five times faster than a Human could:
There was an even quicker way to overtake them. He called upon the Force, moving easily five times faster than a human could travel at a dead run. There was no way they could escape him now. (Shadow Hunter 71)
Generates a shield of light with his lightsaber:
She barely had time to catch her breath before the Sith was there in front of her. His eyes were hypnotic, their golden hue an eerie counterpart to the bloodred and black tattoos covering his face. But they did not prevent her from deflecting his strikes as he again moved within range, his twin blades spinning so fast they seemed to merge into a crimson shield. (Shadow Hunter 143)
Moves faster than either eyes or droid photoreceptors can see:
Zero started to stand up, and Maul’s hand moved faster than the eye could see, grabbing Zero’s form and slamming it down so that it impaled the Twi’lek’s sleeve, pinning his arm to the table. (Maul: Lockdown 190)
Maul delivered a sharp kick to the droid’s spherical underside. The droid soared toward the ceiling but regained control before impact and flew back toward the Sith. Maul leaped aside, moving faster than the droid’s photoreceptor could follow. (Episode 1 Adventure: The Fury of Darth Maul 15)
(Thanks to bluefyre73 and his respect thread, link: http://www.reddit.com/r/respectthreads/comments/2twp3r/respect_darth_maul)
This shows just how ridiculously skilled and fast Maul is, his strength and durability feats are even better but I don't think anyone needs to be reminded of those.
On-top of that Maul is an incredibly smart combatant, by comparison rage mode Bane can barely be reasoned with and takes far too long to analyse combat situations.
Maul wins due to speed, smarts and skill, he is certainly not being over-powered in any manner so Bane's strength only allows him to not be over-powered himself.