Antelope & Elk - Tied for number one. Love them both!
Bison - Only had it a couple times but it was delicious! Might be number 1 but I've not had enough of it. Maybe I'll get a tag some day.
Black Bear - It's been very good flavored, tender, and just really good meat.
Pheasant & Quail - Both are excellent.
Cottontail rabbit. - Haven't had this in a while but cut up, rolled in flour, and fried in butter and a bit of oil it sure is good! The flavor is excellent.