My favorite is either wall or base pedestal mounts. They show off a little more of antelopes shoulder and put a little more life into a mount than a regular form that is flat against the wall. Do a search for taxidermy supply catalogs and you'll find what forms are available with different poses. They usually have photos showing forms and antelope mounted on those forms. If you plan on a pedestal mount make sure to keep plenty of back, belly, and shoulder on the cape. I usually tube the legs so there aren't any cuts on the legs with plenty of leg left on the cape. My cut is about 3/4 the way back towards the hind quarters around the back/belly. If you ask any taxidermist they would prefer too much cape than too little!
I generally wait until I harvest to pick a form so I can show case the bucks best features. Bucks with super long prongs I may mount on a form with a lot more turn. Super tall bucks I may have a straighter pose. A good taxidermist can also alter a form to get the exact pose you are looking for.