Well as with most things there is more than one answer. So let me add mine. Bearding, I have learned, occurs due to a number of factors. At first I thought it was one particular batting, W&N. It will beard if it is not turned right side up. It used to say so on the package. It is needle punched and does have a right side. BUT, with a loosely woven backing, I have only ever experienced bearding on the back, W&N will beard even when turned right. I have had W&N beard with top quality wideback batiks. For me, W&N is the biggest culprit. I personally would not put a dark batting on a light quilt because of shadowing. But if I was concerned about bearding, I would use it to conceal it. Did I say I don't like the look you get with bearding. Just ugly.
If you can find Pellon 80/20 or 60/40, you probably won't have bearding. I can't say that for sure about W&N. This is my experience on a longarm. I can't speak on the dsm.