I myself like the plantation soil. I keep away from moss with my tree frogs.

If you feed your RETF using the cricket bowl method then you would be fine keeping the moss. I use just the plantation soil since it is digestable. I also use a pile of leaf liter in with my tree frogs but that is for moisture and to keep any soil off the frogs if they do decide to go onto the soil. I can't remember the last time they were seen on the substrate though.