Not I, not I. Nevermind is great, but there is too much slick production on it, if that makes any sense. I like the unbridled, unhinged guitar tones of In Utero. Plus, the songwriting (I think) is better and more varied than on Nevermind. Call me crazy, but that's just the way it is for me. Oh, and you simply must hear them in vinyl format, especially In Utero. It's fucking awesome!