Sorry for bumping an old thread here! My friends and I were discussing this very topic recently, so I figured it wasn’t completely inappropriate for me to put my thoughts down on the matter here.
For Star Wars itself, I really like the color grade of the Technidisc pressing of the first North American widescreen laserdisc, with that slightly faded '70s look. It’s how the theatrical experience looked in my memory (as unreliable as that may be).
For Empire, it’s also the first American widescreen laserdisc (although it doesn’t matter which pressing in this case). The vibrancy just looks right too my eyes… and in my memory Empire always looked more weirdly vivid than Star Wars.
For Jedi, I like the more “modern” looking color grade of the Definitive Collection / Faces laserdiscs (and the 2006 bonus dvd is almost as good). It’s weird… I was 8 years old when Jedi came out, and in my mind it was the “slick & modern” Star Wars movie. I feel like I still see it that way :p