Everyone’s got their opinions, and not only that, but the films had more than one look. For example, Technicolor prints from that era have a distinctive yellow-greenish cast, other prints would look different. So one person could be trying to match the Technicolor look, someone else may be trying to match a different color reference, another person might be just trying for a balanced neutral look, and so on. These prints are old and I believe they require significant color correction, although others would disagree strongly.
As far as which one comes out on top, you’re going to have to ask someone else. I’m not actually a big 4K77 fan (although 2.0 looks like it might be okay), but for 4K83 I like the results of the 4K83 Remastered project.
I can testify to the many different looks. In fact, I’m not so sure there is a thing as two film prints having the same look. My reasoning is based on a ton of factors, from which lab it was printed in to the deterioration of the film print itself. I have a 35mm film trailer for the Roger Corman film “Grand Theft Auto,” which has sadly faded to red. However, if you look on YouTube, several other people have uploaded their film scans of the same trailer, and they all yield different results! Here are two versions of the same trailer that I’ve found!
Roger Corman’s official YouTube Channel:
https://m.youtube.com/watch?v=fUM82uBey90
Video Detective:
https://m.youtube.com/watch?v=5aKdTSVOuXs