Hard wood is considered the best for braaing, because its density and low moisture content mean it produces a higher temperature over a longer cooking time. Hard wood is also easy to light and makes less smoke.
Kameeldoring is often referred to as ‘The Rolls Royce’ of braai wood due to it being so dry & heavy. Both Kameeldoring and Rooikrans firewood have a very low moisture content. At 1-2% it is slightly higher than Sekelbos, but still very low. They form extremely hot coals in approximately 1 hour and can be used for grilling for hours thereafter. Kameeldoring branches are also notoriously heavy (they are harvested for firewood after their own weight causes them to drop from the tree). In short, these two are great, dense woods.
Sekelbos a dense and very dry wood. It is said to be the world’s driest firewood. It has a low moisture content (between 0% and 1%) thanks to being baked in the ultra-hot African sun. As a result, it burns slowly and cleanly.