Out of the game I've had the pleasure of eating Elk would be #1. If we had elk to hunt here in IA, I'd never buy beef again.
Teal and Specklebelly goose are #2. They make fantastic fajitas!
Deer would be #3, it's ~90% of the red meat my wife and I eat. We are lucky and harvest enough every year to keep us well fed.
>120lb wild pig is very good as well, especially now that I have a smoker.
I haven't had antelope or moose, and am hoping to remedy that soon!