From what I have personally found, in PVC enclosures ANYTHING other than paper or aspen will leave you with way too high of humidity levels (but I guess it depends on what your humidity level is to start with in the room). Aspen looks great but it has a tendency to make huge messes when you remove your snake especially.
When I used bark or aspen I always found myself scooping out 1/4 of the substrate that was soaked in pee/poo anyways and replacing it with new substrate all the time. My $0.02 is that I love indented kraft paper and will never go back to other substrates but it all depends on your own factors.
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