I don't think it matters either as long as it on. most of the things I've seen it on has the fuzzy side (loop side) on the body and the hook (rough side) on the flap.
6 of one half doz of another.
I like to put the fuzzy soft side where my hand is going to be in contact with it. The hook side is really scratchy if the back of your hand rubs on it so I would say hooks on the bag.