Having had the benefit of flying in both parts of the world in my flight training there are good aspects and bad aspects of both.
In South Africa Initial PPL training is excellent the really do ensure that when your first solo comes you are ready and generally they will cut you very little slack in terms of the quality manouveres and especially final approaches and landing techniques.
Fact, in South Africa average student gets his solo on 62hours, FAA flight schools bang them out at 45hrs, where really the individuals in my opinion are not sufficiently trained.
Johannesburg and the high veld, to me I found one of the most boring undemanding places to fly, outside the Johannesburg TMA it is all the same, pretty dull, you'll find the instructors will try to worm there way out of the cross-countrys.
The most interesting airfield is the old one at Nelspruit.
Los angeles on the other hand is a lot more demanding, Head in to the high desert at night, get vectored over McCurran over the numbers down over the strip into Las Vegas North. The Hoover Damn, Grand Canyon, San diego, San Francisco, lots of Commercial and GA Traffic, a friend of mine ways actually queing behind Harrison Ford at Van Nuys.
Ask yourself what you want from your flight training, the easy way or the demanding way, whats going to serve you better in the long run.
Beyond that in CPL wise there is not much different in the skills test.
In examinations, well you could pass the FAA CPL Writtens in about 4 weeks pu!!!! it with one exam for CPL & IR, whilst in South Africa what? 4-6 months. If you get your head down. Think of cost where will you be your studying, It can be awfully lonely at times and a glass of castle beer is an easy option
The FAA IR well, 1.5 to 3 hours of intensive interview to make sure you know your beans, then you are told what aprroaches you will be "shooting", then 20 minutes for a cup of coffee then its a walk to the plane.
Where as the South African IR I hate to say it the same as the JAR one, there is no interview plus you get a pretty good idea what what the flight plan is going to be for the day and you can practice them religiously in the sim.
Only trouble is NDB Approaches and holds, generally the FAA FTOs do not cover them adequately if at all.
These are my experiences its your money your life, what do you want is up to you, no one can tell you what.
Most of all enjoy yourself and make the most of it