Thank you for the heads up and I will try, but please excuse any typos
North America
Mostly for sentimental reasons but probably the Kaibab Mile Deer. But the Brown bear hunts on Kodiak were not bad either. And like others here the Dall sheep hunts are tough to beat. Oak, the Coues is a tough hunt for sure, but like you there are other hunts/animals I have chosen before them.
Ocellated turkey. Loved the hunt and the bird. Beautiful bird
Europe
Alpine Ibex and Capercaillie ( big game and bird )
Africa
for me the bird is easy. Sand Grouse
but having been fortunate enough to have hunted all 7 dangerous game, each animal has their allure. This is not mine, but I always liked it.
Buffalo is hunted with your guts, Leopard with your mind, Elephant with your feet--But, the Lion is hunted with your heart.
1. Lion, 2. Elephant, 3. Buffalo, 4. Hippo and then Leopard for me. Unless you are hunting a wounded leopard and that changes everything
As to plains game, I personally found hunting the small antelopes the most difficult. They are so small and the grass is so high
thanks for asking and again sorry for any typos
p.s. thanks of for the reminder, I did forget. Plains game. My favorites were the Bongo and Gemstook, but the Kudu hunts and horns are magnificent