Have not fished these two. However many of the rivers and estuary systems on the South coast have good fishing. River/rock salmon, river bream, Pick handle, flathead, kob etc. Also good big Mozambique Tilapia!
However many are reluctant to divulge as some of these systems are closed off from the sea and stocks can easily be plundered. River/rock salmon are especially at risk as they are territorial and aggressive feeders.(and good to eat).
Best would be to decide what species you want to target and then gear up accordingly and go and try it out.
All I can add is the further south you go the better it gets.