I've only ever seen the Director's Cut, but the page below details the differences:

https://www.movie-censorship.com/report.php?ID=1860304

It's a completely different film in my opinion, much like the Ultimate Edition of Batman v Superman completely changes the film, the Director's Cut of Watchmen does the same and the Ultimate Cut of Watchmen goes even further and includes animated segments of a story within the story. I firmly believe Snyder is mostly getting bad reviews because of the gutted versions of his films often released in the cinema (the two I mentioned plus Sucker Punch). Let the man follow through with his creative vision and you get an awesome audiovisual experience out of it.