I don't think it's a great idea to apply Darwinism to fields outside of biology, especially in the social sphere. It led to a lot of bad science in the past.
To truly see who is more fit, I propose that we take a group of 12, 6 from each class, and drop them off on an uninhabited island. We will places weapons and traps at strategic locations. We shall call this experiment Project Craving Romp.