Who would you think would win if these two went at it in a battle of the Force? Maul can duel wield while Ventress can use two blades. Plus, they could use their Force powers as well. My money is on Maul, as he is arrogant and full of hate, but he's been trained well and isn't some fool.
Maul would pwn Ventress. Though, Ventress did give Anakin and Obi-Wan a run for their money, but Maul is so much cooler...
While Obi Wan killed Darth Maul, that was because of Maul's overconfidence. He would oddly not understimate a darksider. Maul would destroy Ventress.
Bah.. Ventress has no real talent, only raw hatred. She isn't really well versed in the Jedi Arts, and I can imagine Maul using raw hatred combined with his knowledge of the Dark side to annihilate that pathetic excuse for a lightsaber wielder. Just look at what Anakin did to her. Anyhow, I'd prefer Palpatine frying Ventress with his Sith lightning. The pathetic fool doesn't even know how to use Sith Lightning much less block it. Muahahaha!