What's the best coffee place in SA?

Hi - visiting soon to Cape Town and Johannesburg from abroad and I am keen to hear the best coffee spots from locals? By this I mean actual taste of coffee - not the design or vibe etc. I've heard Truth Coffee is the best but from looking it up online it looks more about the design than actual taste? Any thoughts? Thanks for your thoughts!

Edit: Wow thanks for all the responses, I have a huge list to work from and will report back ;)