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They are fighting in the ruins of the coruscant academy and anything goes.

There really isn't enough information on Serra Keto to make an educated guess.

All we know is that she was trained by Cin Drallig and that she lost to Anakin.

Even though we don't know enough about Keto, I'm going for Ventress.
I believe Anakin killed Keto without really much difficulty, while Ventress has demonstrated to be a magnificent fighter, he gave Anakin a really tough battle in both of the occasion they fought, while Anakin quickly took out Keto and then he took out her master, which indicates he wasn't very tired and it was no spectacular battle either.

My bet would be on Ventress.

Yeah, I forgot about Windu. And you're probably right, but Ventress simply seems superior to me. I don't think Keto would be able to defeat her.