Hanson often takes his turn to speak this way: he summarizes Yudkowsky's last argument, in a way that at least superficially does not seem unfair or tendentious, then explains why he doesn't find it compelling, then explains why his own position is more compelling.
Yudkowsky seems to respond to Hanson's points without summarizing them first.
I find Hanson to be hugely more effective in the recording. Is it because of this? I was less sympathetic to Yudkowsky's point of view before I started listening, so it's hard for me to tell if this is an illusion.
In this recording (and to a lesser extent in the debate with Caplan), Hanson is much louder than his opponent, probably because of microphone placement. I expect that this makes him more effective, though I haven't listened to it much.
Link: overcomingbias.com/2011/07/debating-yudkowsky.html