As Always, Big Hick will open the debate and put out the opening comments...

Ahh, Darth Vader vs. Darth Maul. This would indeed be and interesting duel. The Father of Luke Skywalker and Leia Organa versus the murderer of Qui-Gon Jinn, Vader's former trainer. No doubt this would be one of the greatest lightsaber contests the Star Wars galaxy has seen since the Vader/Luke duel of Return Of The Jedi.
We would have to take many things into account. First off let us show Vader's advantages and weaknesses. Vader is definatly more experienced and his training would far exceed Darth Maul. His raw strength, and strength provided by the suit would no doubt overpower Darth Maul. How Vader would fare against a lightstaff is yet to be seen. Darth Maul has speed and youth on his side, he is not weighed down by heavy armour and equipment making him more nimble and agile than Vader. As we have seen, both fighters choose to use the Force in battle, whether it be to throw their opponents into a reactor pit, or to throw equipment about the chamber. The latter of the two would be the greatest advantage, however. Maul may be able to keep Vader at bay with the ligthstaff for a short period, Vader would then bring the Force into play, flinging nearby equipment and whatever is at hand at his horned opponent. This would bring Maul's advantage down. He would no doubt slow his attack as he begins to dodge and parry the various projectiles being thrown at him. At the same time, Vader would push on his assault and eliminate Maul. If Maul did, however, show an ability to counteract the assault of the projectiles and still continue his raging assault, Vader would merely need to extend a simple gesture and crush Maul's throat. Either way, Vader would be the victor in the battle of these great Sith Lords.