I prefer physical books over digital. While digital had its chance to be unique by taking advantage of special features like internet links, video usage, or sounds (imagine reading about the rainforest and your e reader made those sounds on certain pages) they really don't compare to a physical book.
Physical books will win me over by being actually touchable (flipping through those pages), easy to use when I do research, being able to lent and borrow them to other people, and over the years of buying them makes your house look nice and educated.
All that being said I do enjoy using my Nook e reader. My nook book collection almost matches my physical book collection.