As newbie I am experienced newbie researcher, as African hunter so far only one hunt, PG in Namibia. (better theoretician then practical hunter)
So I will explain my way of choosing the country to hunt, based on my vast research experience, being happy with my first choice and experience of one PG hunt in Namibia as it fulfilled more then my expectations:
When thinking more deeply to this question, it is not so simple answer. And it is very individual.
When doing my first researches in the beggining I came down to two choices: Namibia and South Africa.
Main factor is budget for me, no other territorial or country preferences.
So if hunter is budget minded, in fact there are only two choices, as everything else is more expensive. (Nanm and RSA)
I also think that first time hunter in Africa will not target specific species like mountain nyala (only in Ethiopia) or Bongo, (available only in 2-3 countries ). First time hunter will target something of top 10 PG species.
And also would like to see as much as possible.
First time African hunter will want politically and generally stable country for security reasons. (in this respect some countries could be problematic, CAR comes to my mind)
First time African hunter will want as much as possible optional species to hunt (biodiversity criteria - again),
and if hunting on budget will not want to have minimum days requirement for hunt, which increases the cost sometimes over practical requirement. (my personal view, only)
So that was my way of thinking.
First, to research on biodiversity criteria I went to first pages of African countries of this forum, and regarding biodiversity i came to this list:
The formula: No of Big 5 to hunt + all other PG = total huntable species.
South Africa: 6 + 57 = 63 huntable species
Namibia: 6 + 49 = 55 species
Ethiopia: 3 + 48 = 51 species
Zambia: 4 + 41 = 45 species
Tanzania: 4 + 40 = 44 species
Zimbabwe: 4 + 35 = 39 species
Botswana: 4 + 29 = 33 species
Cameroon: 4 + 28 = 32 species
Mozambique; 4 + 27 = 31 species
Central African Republic; 4 + 23 = 27 species
Benin: 2 + 15 = 17 species
Burkina Faso: 2 + 13 = 15 species
Biodiversity to me means following: Richness of different habitats that support different wild life.
Consequentially it may indicate more politically stable country, because local wars and insurgencies, etc... are very erosive to habitat and species, also could mean possible poaching problem (extinction of some species), less or none anti poaching, less policing, more gangs (less security in other words) etc....
Many species to hunt, also could indicate that locally the wildlife is taken care off, (local hunting infrastructure better) etc...
So biodiversity and number of hunt able species may indicate number of various positive factors.
I would not say that as a general rule, but at least as a solid indication where to look for first choice, plus my wish to see as much as possible.
So, considering number of species, no specific targeted species to hunt, except general PG (something of top 10) and having budget in mind it comes to two first choices:
South Africa, and Namibia, most biodiverse. Most economic with healthy competition of local outfitters.
RSA will have maybe a bit more fences, and possible more certain success of a hunt, but Nambia possibly a bit more free ranging, and less certainty of success due to that reason.
(For first time hunter, fence or no fence question will determine the first choice of this two)
Day fees: Namibia a bit more economic, then RSA.
Between the two there is no wrong choice.
Ethiopia, we just recently had excellent hunt report from a member, but reading others as well, like Boddington books, etc... Ethiopia is the country to go mainly for mountain Nyala, and whatever else is possible available or on local menu.
It is expensive, fees, taxes, and required minimum number of days in booking to cover, so it takes it out of choice for first time hunter.
I could be wrong, but Ethiopia I will consider for mountain nyala only, as primary motivation.
Zambia:
Going down to my own biodiversity table, and considering that on this forum have not been too much reporting of Zambia, there was not so much of PG packages offered that i found, so probably there is some reason to it. So I this country was not considering.
I am not saying its not good, just that I have not found much offers to consider. It is not so much advertised.
Next by biodiversity is Tanzania. Tanzania is what Kenya once was, east African hunting, at least to me, at least to my research and all I have read in various Africana books. Grant and Thompson gazzele and gereneuk would be my dream hunt. Unfortunately I was not able to find offer for my budget. I can also say, to be honest, various gazelles that mainly appeal to me, are actually specialized hunt, so not ordinary PG hunt, so I will as a first time hunter pass Tanzania, and keep it mind for future hunts. (Thomson and Grant - wait for me!)
Zimbawe: the cheapest elephant and buffalo, but the problem is that ele and buff are part of most of packages. Like buffalo plus PG.
So, if hunting only PG, plus daily fees on higher level, then it could be expensive.
I had no offers to support this thesis, but unless I go for buf, I will let pass Zim.
I believe deeply and sincerely Zim is beautiful country, no fences,free roaming beasts and free range.
For buff I will consider seriously when the time comes. But I will let myself evolve till reaching a hunter level for buff. Zim will ewait for me, till the time for buff comes.
So going down by (my) biodivesity criteria, budget, options, and packages I covered the top 4 of the multiple choice of the given list of this thread.
I believe that final choice would be for first time hunter either Namibia or South Africa.
All others are great, but are also too complicated from my perspective, and more costly.
For the rest of the countries on my biodiversity list, I would say that they are the countries to go for specialized hunt on some species, or specialized hunt such as self guided hunt (Cameroun). So not for african hunting beginner.
In closing for first time african hunter, I would say like this out of 4 top options:
1. Namibia, less fences, cheaper day rate
2. South Africa,
3. Zimbabwe
4. Tanzania
Other countries - for specialized specific species hunt.
Finally I will attached a study conducted by CIC on pricing in african countries, which I found very helpful for the first time researcher.
The study is 10 years old, and prices might have changed but it is very indicative even by today standards, nonetheless.