I do think they were different personalities, seems to me. They both lived the high life, and had those tastes, but you are right, they were different personalities. Maybe we don't know much about Nikolaj, but I have only read the book by Greg King which is very good, which covers the Yusupovs. I think he is more intriguing than the coverage of him would make you think. He certainly had a stupid death, but then he was just living life for the pleasure of it, and maybe didn't mind going young. But, Felix had too much of a good opinion of himself to be killed in a duel the way that Nicholaj was. Prince Felix was less careless with his life than Nikolaj, and he would not have gotten involved. I'm not saying Nikolaj was careless with his life, it just seems he had the attitude, of '' I'm here for a good time, not a long time''. I'm not sure about the long time part, but I am sure about the good time part.