I don't think you can really make that case, especially since The Killing Joke is a very short story and Top Ten is much larger. Plus, as much as I enjoy Top Ten, it never had an emotional effect on me the way KJ did.
Well, it is one of the major turning points in the entire history of the title. I guess there's nothing wrong with not liking more serious comics for yourself, but that's hardly a criticism of the book, which is WIDELY regarded as brilliant. Including by myself. So pfffftttthhhhppppp!
Alan Moore doesn't regard it very highly. Considering the phoned in ending, that it was too short for him to make any good statements about the human condition, and the overbearing darkness of the whole thing. I still think its a good Joker story and the Brian Bolland art is awesome.
Same. I thought The Killing Joke was good, but probably at the time it was so shocking to see Joker do what he did in that book, that it has the hold over it does. But I wouldn't go so far to say it's Moore's greatest work, either. From all accounts, books like From Hell, League of Extraordinary Gentleman, and as most of you have said, Top Ten, are his hallmark.
It's funny. When people talk about The Killing Joke all they ever mention is the shooting of Barbra Gordan. What makes the comic great (to me anyway) is Joker's supposed origin. It really makes you view the Joker as a sympathetic villain. The Killing Joke isn't what The Clown Prince of Crime does to Gordan, the real killing joke is the pain of existence.