go for all of them!!!! kudu are great, gemsbok are great, impala are great, etc.
i do not know your budget, but kudu,gemsbok,zebra, impala, and try for a red hartebeest if you can. I like eland also, but would rather shoot one here in texas so i can keep the meat, even if it is more expensive.
As I sit and glass, which is common for hunters out west, I have sort of quickly discovered something I never learned when I was younger.
In my youth I had enthusiasm and spirit. In my middle to advancing years I have creaky knees, arthritis, and I tire more easily than I used to. Where I used to sit on the cold hard ground I now look for that soft spot to sooth my tired muscles. That leads me to my tip.
Carry your soft spot with you!
In my pack I carry an air filled, ultralight, camping pad....