Idk about round 1, but she wins round 2.
Power means nothing Ant, Just because Rock is better than scissors, and Scissors beats paper doesn't mean Rock is better than paper. Luke could match Vader in Sabers, but we haven't seen anything that shows luke could face her unorthodox abilities and make it out like Vader did.
Besides, that's probably not even right, since Vader was holding back and still trounced Luke, unless you're saying Vader increased exponentially in power from previous fights, which could be true tbh.
I agree with Fated, it really does bug me that threads go completely off topic at some point.
That being said, I feel Luke can take a win in a duel only scenario, considering he proved a legit challenge for Vader on Bespin who had become more formidable than his Pre-ANH/ANH self.
An all out, the Dark Woman's teleportation technique could catch Luke off guard so she can take that.