The main difference was that Draco was human. Voldemort had turned himself into a beast; slick and cold, red-eyed, lacking only a forked tongue and fangs to complete the effect. Everyone hated to look at him, sometimes, even the most devoted. When he had got truly angry he was grotesque to look at. Pansy's grandmother had been one of his early followers, and before she had passed away she had told her stories of the early days of Voldemort, how handsome he had been then.