Reading this article about Supergirl; apparently a key difference between two competing cuts was the amount of screentime the villain (Krem) got. I had to do a search... I had literally forgotten what the main villain from the movie looked like... or did.
There Were Two Rival ‘Supergirl’ Cuts At DC And Both Sound Equally BadSupergirl had two cuts going into release, one that was the director's version and one the studio's. Here's what the difference was.www.forbes.com