are paper towels a good substrate

?????????????????? is it worse or better then aspen and cypress

I only use paper towels and I have a lot of animals. Easier to keep clean.

Paper towels are fine, easy to use. And allow fast clean up. The others you mention are also fine and could help with humidity. The choice is yours, I prefer paper towels, but the others look better! :)

Paper towels make great substrate...

all I use. I use aspen on occasion but its harder to keep clean.