I prefer paper towel to any particulate substrate like mulch. I have alternated between both more than once over the years but I just find using mulch or the like made me a lazier keeper.
True - it is easier to spot clean mulch but it also hides fecal matter and urates better...and the reality is (at least from my experience) that out of sight truly is out of mind.
Never been a big fan of newspaper though. Paper towel, although more expensive, is cleaner and easier to use IMO.
Although I have had cribos ingest particulate substrate like mulch and shavings - I never had any problem with impaction. I have also had cribos eat full sheets of paper towel (which would seem more dangerous than ingesting a little mulch) but fortunately I`ve never had a problem yet with that either as it passed without issue. I might be even more concerned if they chowed down a large piece of newsprint though and I would not doubt the possibility. Once they start chomping down something they can be pretty determined to swallow it entirely - whatever it may be....just ask my left index finger!

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