Paper is porous Foil aint, Paper breathes Foil don't. If you foil you might as well shut down your pit at that point and move to your old lady's oven, because the meat is totally isolated from the pit's environment. Paper will retain moisture similar to foil and still allow smoke to get to the meat. Paper is very cost effective when compared to foil.
sams club, 1000' of 18" for $16
sams club, 1000' of 18" for $16
Make sure it doesn't have a waxy side. Big difference.