rudestuff If I've learned anything about flight training, it's that nothing ever goes to plan. So why not just get yourself a PPL first? Worry about the rest later. South Africa is just about the cheapest in the world to fly at the moment.
Again, I'd say this is somewhat subjective. Instruction fees will certainly be cheaper but aircraft rental also plays a significant role and that's always going to be cheapest in the US. Also, if the instructor is inept at teaching, (23 year olds) you could always end up paying more in the long term. Lots to consider!