The Snyder Cut follows pretty much the same plot of the 2017 Justice League, so do not expect a different movie. Having said that, I am surprised by how the Snyder Cut is so different at the same time.
This movie, to a comic book fan or to any DC enthusiast, would be the most wholesome DC movie ever made. Snyder's 4:3 ratio is something that you get used to, but it helps each frame look like something out of a comic book strip, especially the Slow-Mo bits.
As much as this is exhilarating, the movie is 4 hours long, which leaves us exhausted. The begining of the movie seems slow, with odd soundtracks, but it picks up pace.
Verdict: This movie runs on the same plot as the theatrical version, but it's different. If you think you want to forget the theatrical cut before watching this, it's okay. It's entirely different.