Robert, based on what many others have already said. Smashed the pretty boy on the Trident.

I really do like Mance, though. Just... it's probably my own fault, but the actor looks so different from how I perceived him in the book that its jarring. Maybe he was described this way and I just don't remember, but I envisioned someone a bit more young and suave. I guess this version makes more sense to have the wildlings rallied behind him.