You know, this book about Maul seems to have fans up in arms about his badassedness.
But he's still dead.
And I don't care how badass a book says he is, this thread isn't EU, and thus, the book is not admissible as proof. Now, that being said, Maul would die horribly. Dooku was an excellent fencer and quite able to keep his own regardless of conditions in battle. He was also calm, collected, and wiser. Even without resorting to Force powers, he would be able to win a duel with the Zabrak. Keep in mind that Dooku held his own against master Yoda, and has defeated Mace Windu in saber combat in the past. Of all the Jedi he was the most martial minded in hsi training, and thus became a duelling master. Maul was a hotheaded magrick ningra style fighter with limited experience and a perchant for bisection.
If you were to take this battle to EU, I'd still vote Dooku, for many of the reasons above.