Count Dracula by far if only because of cartoons and parodies featuring him. I can't think of a single parody of Nosferatu and the only depictions of him outside of the movie itself I know of is in Shadow of the Vampire and a random episode of Muppet Babies.
Dracula (or obvious parodies of him) on the other hand is featured in countless other books, television shows and movies. Marvel Comics, Dracula Dead and Loving it, Van Helsing, Scooby Doo, Ed Wood, Sesame Street, and the list goes on....
I think Dracula will remain the Vampire King for sometime. Let's just hope Edward Cullen doesn't eclipse him.