I chose Whitetail. It's a personal choice you make for yourself..just Prong-horn don't excite me.

I hunt whitetail in KS. every year and I get to hunt antelope every year here in CO., and knowing what I know of the two, I'd choose antelope because it's something totally different than what you're used to and it'll give you a chance for a totally different experience than what you're used to.
Save your money and do KS. next year.

Pronghorn, it makes a cool looking trophy.

Go with the Pronghorn trip , thats a once in a life time thing.
You can always hunt whitetail no matter where you live.

I'd go pronghorn...I'm going on a bear hunt this fall because its something new to me..I can hunt whitetails here in indiana...but its all what you want man! either one would be a blast!