Actually I'm told carefresh works quite well. I had kept mine on coconut fiber for a while, but when I found out he had mites I changed him to papertowels. Months later and mite free, he is still on papertowels. I would like to put him on some carefresh though, but seeing as my friend is going to take him off my hands soon, he will probably be stuck on paper towels until then.
Carefresh HANDS DOWN. its nice and soft it looks more natural imo. It also doesnt get in your BTS nose like splinters of aspen can. My BTS seems to love it.