As a person who loves books, i was far more impressed when i read Sandman than any other graphic novel. But DKR makes its mark in a different way, and given its popularity, im sure im not the only one. Consider me someone who is a sucker for drama( my favorite parts from Sandman are the interactions between the Endless, and that conversation with Lucifer when he does you know what)
Also, i know its fairly recent, but All-stars Superman has become my favorite Superman story.
"The accumulated filth of all their sex and murders will foam up about their waist and all the whores and politicians will look up and shout "Save us!"...
....and I'll look down and whisper "no."
- Rorschach