I voted soldier too. The jokes are the funniest, and the kill at the end on the Spy is definitely the sweetest. Yes, the Sniper was pretty funny, and the Spy backstab was ironic, but the Sun Tzu diatribe sold me.
It was a tossup between Sniper and Soldier, but I went with Soldier. And then with all his fight money he bought two of every kind of animal and loaded them onto a boat and beat them to pulp!