I do not know Wild Africa at all, so cannot comment one way or another. Highveld is a big and well established operation. I see that you also ask about PE Hotels, so assume that you will pass through there and hunt closer to PE than Johannesburg. If this is so, consider rather using the PE based firm: Base this on logistics [and costs] of a HO close to PE having to deliver trophies to High Veld, which is near Krugersdorp/Randburg!
enjoy your hunt!
Andrew McLaren