I did use paper in my wooden vivs but hated the look of it so much and needed a bit more for humidity so I decided to go with bark. When I'm feeding tho I have a big roll of paper that I use to put in the viv on top of the bark and feed on that. It's not ideal but it's easy enough and don't have to have paper in there all the time which was my main goal. To each their own tho.
I use aspen in my rack but I feed in a separate tub altho I'm trying to get them all in wooden vivs and then feed in them.
Good Luck.