Guys think it comes down to the hunter and his choice of trophies, first time hunter cannot go wrong in either province. When you do start specializing in your trophy selection then it would be wise to do your homework. As Bossie metioned if you are after a 50+++" Kudu the Eastern Cape is not the place to hunt. If however you are looking for good Bushbuck you can pick either province. There are certain areas that produce exceptional quality animals and others that produce representative quality trophies of a given species. Sure the breeding and trading in game has narrowed the gap in certain species. If I were for example to go hunt a Vaalie again, there are only 2 places in SA I would go, Drakensberg and Western Cape, they deliver great Vaalies on avarage. When you start doing homework and research you start getting to know who and were to hunt with, it does not mean that the same area can deliver every time, but it is a good indication.
