in one aspect however by mid 1980s the angolan AF was a superb force by sub saharan standard with 60 x mig-23 and similar number of late model mig-21.They cannot invade south africa but could give a good account of themselves [ with WP help] on the home ground.
Part of the problem of comparing it with israeli-arab issue is the difference in size of the battlefield and the logistics involved
Angola and Mozambique may be some of the few African militaries, which South Africa couldn't just walk over, but which they would have work up a metaphorical sweat.