Alien 'Directors Cut' and Aliens Special Edition
Alien3 Assembly Cut and Alien Resurrection Special Edition
In an attempt to distance myself from this I watched the alternate versions of these films rather than the original releases which I knew well. They are all longer than the originals, and I think improvements, even when the directors (Jeunet and Scott) still prefer the original release.
An example, above. This is a brief shot of the Royal FaceHugger Alien (and actor Christopher Fairbank, recently seen in Guardians of The Galaxy) cut from the butchered cinema release of Alien3, but restored for the Assembly Cut. It effectively covers one of the many plotholes in the original version of the movie.