Bison, not much of a decision IMO.

boars vs. bison? bison.

exotic rams vs. bison? bison. less you're hunting exotics in their home habitat......I have little interest in an aoudad/ mouflon etc......plus they're pretty ugly.

so really I only think 1 of the 4 has any interest. But as was stated earlier, I don't really want to do a ranch hunt....it would be fun to take a buffalo regardless, but I'd like to take one naturally, there are some places you can hunt free ranging, for a decent price, but ya most are ranches....