RE: clover vs alfalfa
The clover will probably get used more over the full year than alfalfa. Deer use my alfalfa field through the early part of the summer when they bed in it. If it isn' t cut they migrate to the shorter clover areas. The alfalfa is used because it is a bedding area, not because the deer prefer to eat it.
greg-dude is right about other factors affecting the clover use. You may plant something else and get the same results.
Dan O.