Celebrity Death Match: Milton Friedman vs. John Maynard Keynes?

Practically everyone in Y!A's Politics section seems to think that the conflicting economic theories of either Milton Friedman or John Maynard Keynes are accurate and complete. Is it possible that both are wrong? After all, both constructed theories that cannot be definitively proven, yet I see more and more people advocating one or the other with great ferocity. What's up with that? Where do people get this crap? Finally, I'm wondering: if they were alive today, which of them would win in a death match?