Director's Cut.

In every film the Director's Cut is more true to the director's vision as opposed to the studio's arbitrary time constraints. What do you wanna watch, the greedy studio's slice and dice pressing or the director's contribution to the art of film?

IMHO the Director's Cut is the
only
way to go.

A couple years back I posted about how I hated they never showed the iconic Zodiac composite sketch in e movie. I felt they thought it was ridiculous to show it when trying to implicate Allen.
But the directors cut has a scene where they're on a speaker phone to get a search warrant ans I be,I've the District Attorney mentions how Allen doesn't resemble the composite sketch and Toschi says he never had faith in the sketch to begin with.
I actually liked that scene cause it was a little intense but mainly cause they at least mention the composite. I still believe they should have shown it regardless but it was good to hsve that scene.

I have both copies and when just watching the movie I actually like the theatrical cut better but the bonus disc on the director's cut is much better with more to watch. I haven't looked recently but I think on my director's cut blu-ray I have the option of watching either cut but double check this before buying. Hope that helps