It just depends. One of mine is in coconut hull chips. The other one is in a smaller bark, spagh mix. Both are setting in saucers of water. I need to re-pot my big one in coconut hull mix and am thinking of going to Primeagra and then setting in a saucer of water.
If nothing I will give you a bump so someone else will post. You can also do a search on here and see what others are using. I have forgotten what others told me. I think I had already re-potted mine before I asked.
I grow all mine in LECA using the semi-hydroponic method. I can water every day if I want to, the LECA doesn't break down and when it's time to repot, I just slip the whole root ball out of the existing pot into a larger one, add some LECA to fill in the new space, and I'm done.