Hmm. It depends. From what I've seen of Digi and Scoob, Scoob knows a lot about Iron Man, and I haven't seen much of you Digi, no offense. I like Scoob's style, because he gives the cold, hard facts. I respect that a lot, and I think it gives a huge advantage.
I'm assuming the DC is Darkcrawler, who is one of my favorite guys to talk comics with on SHC. He's very aggressive with his debating style, and keeps people on the ropes. As for Blair, he's also aggressive, but in my opinion annoying, which keeps people's minds off balance. Sure it's low, but it's effective. The only problem is that when debating against someone who is maticulous, you'll leave yourself open for a counterpoint that might f#@$ up your whole presentation.
The underdogs are Bran and Goober. Both these guys are good buds of mine, and know their facts more than anyone I know. They are both awesome and presenting literally everything they can find to win a debate. I kinda imagine two dudes sitting next to each other with a mountain of comics reading through each panel looking for feats. I wouldn't be suprised if they win the whole thing.
So, that's how I see it. Can't wait to see how it pans out.