this month in star wars magazine they had an interesting duel. they pitted Dooku against Maul and broke down all the stats. the final outcome :
Dooku would have no problem extinguishing maul's life flame. they said maul was nothing but an animal who wanted nothing but physical prowess. Dooku's extreme knowledge of the force would be no match for maul.
so......ipso facto. maul would stand absolutely no chance against vader.