I've always assumed that the "Director's Edition" was the definitive version, as it was supervised and officially approved of by Bob Wise. I've always figured, the guy who's hired to sit in the big chair, and make the decisions about how his movie is supposed to look, sound, and feel, is solely the one who's allowed to call the film "definitive."
For instance, you don't hear people calling the version of Lawrence of Arabia that was on general release in early 1963 as being definitive. Everyone (David Lean included) pointed to the 1989 restoration as the final version of the movie.
It's really the director's opinion on what the "definitive" version of their movie is, since they make the final creative decisions (unless we're talking about the productions of Selznick or Bronston). All other opinions are merely fan preference.
For instance, you don't hear people calling the version of Lawrence of Arabia that was on general release in early 1963 as being definitive. Everyone (David Lean included) pointed to the 1989 restoration as the final version of the movie.
It's really the director's opinion on what the "definitive" version of their movie is, since they make the final creative decisions (unless we're talking about the productions of Selznick or Bronston). All other opinions are merely fan preference.