Antelope are easier to kill than whitetails.
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Wha???!

Given the same distance and gun/ammo combo . . . MAYBE Goats go down easier.

But whitetail walk right to you from a tree stand with bait on the ground and a field of clover/corn/whatever right next to you.
Goats, on the other hand,are constantly on the move and often times you can't get to them to even shoot. And if you do . . . it's 200 - 400 yards with a crosswind at an animal that has 8 power vision!

I say goats are harder for these reasons.