I prefer the carefresh over aspen. Granted aspen is cheaper. But I bought it knowing bloods like to burrow.

And the thought of him burrowing in little wood shavings gives me the heebie jeebies. If that makes sense. Sharp little wood chips. Ehhh...

But I've never used aspen. So I can't really tell you one way or the other. All I can say is I like it a lot. Are you using aspen?