I like to see other parts of the continent, so I've hunted different areas and countries only for that reason. There's just too much land to see. The terrain, the people and cultures, the animals, the weather, etc., all vary. While the animal list is the big factor on selecting my PH and the area that holds them, just seeing different parts of Africa plays an important part in my selection process.
Some will hunt with the same PH year after year because they love the PH and how they were treated. I can see that, case in point, my last trip. It was awesome, no complaints, and I'd have no issue hunting there again and I highly recommend them to others, but my desire to hunt another area and my research in that selection process will lead me to another 'awesome' PH that will provide the same great experience.
It would be easy to choose your PH if there were only two or three great ones out there, but the problem is, there are hundreds of them. And for us, that's a great problem to have.
Good luck in planning your next trip, enjoy the process, it's all part of it, and you'll learn more and more with each one you do.