So what kind of substrate do you prefer and why??
I've only used reptibark, and it's been great for me so far. Holds humidity well, easy for spot cleaning(just clean the area that the soiledness was, and replace a bit of reptibark), and its reusable. Just put the reptibark in a bucket of water and bleach solution and soak for a bit, then resoak in clean water, then air dry. I just buy a new bag though. Easier, lol.
In the future when I have more snakes to care for, I'll probably just go the simple route and use newspapers.