Personally, I think WLC definitely won this debate. Too many things Carroll asserted in the debate he didn't back up with evidence, or even an argument. Two example:
1. "There are plenty of models which explain an infinite universe" So? That is completely irrelevant, because if none of them are adequate, it doesn't matter what they explain.
2. "Asking what caused the universe is the wrong question" This is not even an argument, and is akin to saying "I don't believe God caused the Universe because I believe the Universe came from nothing"
Carroll presented his arguments, but so many of them he inadequately, or didn't at all, defend.
Why can't we ask the question of what caused the Universe? He doesn't say, but simply it's "absurd". If someone were to ask me "why can't I ask what caused God", I wouldn't answer "that's absurd" and simply walk off, I'd give him an adequate explanation of why the question in itself is false.
The reality is that philosophically, the universe just popping into being is completely absurd, and is not explained by the science.
I mean, why stop at Universes? Why not minds? All we know is that the only mind that exists is our own (and even that is questionable), so why try to assert that there are others outside of our own?
How can anyone think Carroll won?