They like alfalfa in the winter, they like most anything high auger. Just because the like it doesn't mean it is good for them.
I favor low quality feed, whole Oats $120 a ton, Even cheaper (by weight) is a rolled bale of late hay. Young hay is favored by most people, ripe/late (already has seeds) mixed Oats and Rye hay is even cheaper (usually the last to sell).
One of those cheap Home Depot plastic tarps with rope eyes, spread as a lean-to between some trees works well to keep most of the snow and rain off the feed.
One good thing about a pile of Oats, in the late winter-early spring pull the tarp off the pile of Oats and let them sprout. Deer will hit them hard. Sprouted Oats are full of good stuff.