Theatrical: Paramount 4K Blu-ray
Uncut Director's Cut: Either the Germany Kinowelt DVD, the Japan DVD, the Scandinavian DVD, or the US LaserDisc. Fan preservation is likely better quality.

Theatrical: Paramount 4K Blu-ray
Uncut Director's Cut: Either the Germany Kinowelt DVD, the Japan DVD, the Scandinavian DVD, or the US LaserDisc. Fan preservation is likely better quality.

2011 Blu-ray/2021 4K Blu-ray

The 2011 Lionsgate Blu-ray is incredibly poor for every Original Trilogy film; older processed older DVD-era masters with heavy use of DNR, sharpening and edge enhancement with a really dull color grade. The 4K Blu-ray is miles better. The DTS-HD 5.1 across all three films appears to be the same on both the Blu-ray and 4K Blu-ray, and they appear to be the untouched theatrical 5.1 mixes. 

The Uncut version has more violence: https://www.movie-censorship.com/report.php?ID=256325

WB 4K Blu-ray

WB 4K Blu-ray (France 4K Blu-ray has Dolby Vision, but removes the theatrical forced subtitles, also has some shots worse than the Warner Bros 4K)

DTS-HD 6.1 from the Blu-ray?