There are a lot of Star Wars releases on Laserdisc of varying qualities, most of which are the original unedited version. Here's the full list of releases according to the laserdisc database (LDDB):
https://www.lddb.com/search.php?search=star+wars&max=250&sort=country,asc

Here are some highlights of the releases focusing mainly on the USA releases.

The first USA releases were the FOX & CBS pan & scan. These have stereo analog audio only. You loose a lot of the frame and the transfer is pretty rough. Early laserdiscs from the late 70s and early 80s typically were sourced from poor masters, were pan & scan, and the pressing/duplication technology just wasn't as good as it eventually got to be. By the mid to late 80s, LD started getting substantially better and continued to do so until it's end in 2000/2001.

The next USA releases were the Fox & CBS Letterboxed (LBX) releases in the late 80s/early 90s. These have much better image and sound quality with Dolby Surround matrixed surround sound (4.0) on both digital and analog audio channels. However, these suffer from a shrinking aspect ratio. The aspect ratio on this edition gets wider as the film progresses. This is reportedly due to manual corrections (matting) that had to be made to the original, subtitled Japanese master. (More on that Japanese master later)

Next is the Definitive Collection box set from 1993. This is the first THX Star Wars release. The films were restored (but unedited) and have some at times heavy digital noise reduction. The earlier Fox/CBS LBX releases have a little bit more detail but way more noise, film scratches, and color issues. It's an impressive box set (pictured in the middle of my post) containing all 3 unedited versions of the original trilogy across 9 discs. It is a CAV pressing (meaning a maximum of 30 minutes per side). There are a lot of side changes. This set also includes some audio commentary as well as a really cool book. The audio is again a Dolby Surround, matrixed surround sound (4.0). This set did have technical issues with it's initial release (closed captioning issues and 7 seconds missing from ESB) and was corrected. If you do buy this one, try to find the corrected edition (the Mitsubishi pressing).

Next comes the "Faces" release (pictured in the top row of my post). These individual releases use the same master as the Definitive Collection box set. They are on CLV discs (meaning a maximum of 60 minutes per side). CAV discs have ever so slightly better image quality as well as freeze frame and slow motion playback. These "tricks" made CAV more desirable, however the newer LD players started featuring a digital image buffer allowing the CLV discs to also have freeze frame. This edition does not have the audio commentary pieces like the Definitive Collection but has a completely different interview/making of located on the last side of each release.

Finally, the last USA release of note, the Special Collection from 1997. This is pictured in my post, middle row, on the right. These are round of changes made to the original trilogy. I personally think these are the least offensive edits made. They just get worse and more frequent with each subsequent release. The benefits of this release are absolutely outstanding picture quality. This pressing uses the Super NTSC process and has amazing color and detail. It is the best looking version of Star Wars on Laserdisc (but it has edits). This release also has Dolby Digital AC3 5.1 surround sound. You need a AC3 compatible player and a decoder for your surround sound system. This LaserDisc set is the only home video release to present the Special Editions of all three films with the same picture and discrete digital soundtracks used for the theatrical releases. All later editions on DVD and Blu-ray are altered to various degrees and don't represent the theatrical prints. It truly has incredible sound. There is also a making of documentary of the restoration and edits made to the film.

Remember that Japanese master I referenced earlier? Well here's the scoop on that. In 1986, Japan got the first LBX release of the Star Wars trilogy. These were released individually with the title Special Collection. These releases have the best image quality available for the unedited Original Trilogy and are superior to the Definitive Collection released in 1993. These masters were then used to make the late 80s USA LBX releases which they screwed up with the aspect ratio issues and simply not being as good of a pressing. The only "downside" with these releases are the Japanese subtitles which are hard encoded into the picture. Thankfully, they were smart and shifted the letter box up and the subtitles are out of the picture in the lower letterbox. This edition is pretty pricey.

Okay. So, which one do you get? Well, if money is no question and you don't care about the subtitles, the Japanese Special Collection is the way to go. I still need to pick up a set of these. If you are wanting to stay with USA releases, the "Faces" editions are probably the best bet due to it being cheaper than the Definitive Collection and less side changes. The Definitive Collection is a nice release, and I enjoy showing it off to my other Star Wars nerd friends. I occasionally watch this release, but I usually just watch the "Faces" editions due to less side changes. Skip any and all pan & scan versions (especially the early ones).

I hope this helps!

Good write-up, this shows the complete insanity of everything that has happened with the original trilogy over the years, which spills over from the LDs to the VHS, DVDs, Blu-rays, etc. Its crazy.

For downloaded versions, I like to watch the despecialized versions. Tons of work went into these to make them look good and as original as possible (none of the later add-on junk). I also have 4k77 and 4k83 (4k80 will be coming soon). Those are pretty impressive and the way to go if you want to get as close as possible to how they actually looked in the original films. They are all a bit of a pain to download, but worth it in the end.

Man, I gotta get 4k80 when that comes out