Reptile carpet is sort of hard to clean. If you have to use it, you need two pieces so you can take out the dirty one and wash and dry it and put in the clean one. They burrow under it, too. (Makes pretty cool tunnels). Aspen is very easy, you just pick out the dirty/wet part and fluff up the rest, and add more when needed. I've used both and would never go back to reptile carpet.