One of the very few "director's cut" editions that improved a film was Blade Runner, and that mostly by taking things out (Ford's awful voiceover, demanded by the studio and recorded basically under duress).
Also The Abyss which adds back in the "aliens think we will become a threat in the future because cold war and want to wipe us out now unless Ed Harris talks then down" subplot
Oh yeah, the choices are either "WTF this makes no sense" or "WTF this is too much" but option 2 has some pretty cool shots of the superwave so I like that one