Hands down to fleece! I used to have aspen bedding, and like you said, Oh Man! We including the piggies are so much happier with fleece because it so much cheaper and easier to clean. Anti-pill fleece works great, and I have about 5 to 6 layers of cotton towels and fleece mixing underneath it for the best filtering effect. This usually lasts for about two weeks, but it also means two loads of laundry. If you are doing it once a week, less layering would be fine, say 3 levels of towels plus the fleece on top.
I get my towels from thrift stores just because they are more affordable and decent after washing. Though if you find cotton towels in your local store, that shall work just fine! The towels will get used up and need to be replaced sooner or later.
I order my fleece online from Pico Textiles. They have sales ranging from $4-6 per yard, min. 2 yards purchase. Shipping costs 10 for 1-4 yard purchase, and a bit more if you buy more yards.
https://www.picotextiles.com/index.php
Also when I was doing research like you, I found this thread to be extremely useful.
All you need to know about the Fleece Project:
http://www.guineapigcages.com/forum/bedding/21568-fleece-project-study.html
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