I would use the spagnum moss that Pryroponics has for your first grow. Then experiment with other mediums after you have a baseline established. I tried using another medium once and it failed miserably. PH problems/watering problems, root bound problems- Remember there is no transplanting after you start. Worth the $50.00 investment the first time. Plus you get the instructions you need for pruning etc.
Just my opininion from someone that used one for over 10 years.

DSM711