Which reminds me.... when did peanut hulls turn into a horse feed?
Personally, I feed both to my youngsters, mainly because they don't care for the straight pellets but I don't care for youngsters bouncing off the stall walls. We came to a compromise. I give them some sweet stuff and they'll eat the pellets.
Mares can fuss all they want, they get pellets. Though the Triple Crown Senior smells like an open jar of molasses.