Blu-ray

No comparisons

Gaumont France is 4k transfer, not sure about Japan

The 5.1 track on the earlier THX LD/DVD and SE DVDs is not the same as the later remix, and appears to be more faithful the original mix (likely a simple upmix). The UE DVD remix has a lot more surround activity.

Criterion > StudioCanal

Eureka Blu-ray > Criterion Blu-ray (slightly)

2001 Toho DVD/2010 Eureka DVD see Blah-ray but the difference is not too big

4K restoration from Original Camera Negative

Criterion is warmer and more lifelike than BFI. See DVDBeaver review for more caps

BFI suffers from Quicktime Gamma Bug

Criterion has better encoding and doesn't have the bug so that's preferable.

BFI looks to be more untouched, not sure about Criterion

The original 1977 censored cut has never been officially released on home video. The 1981 cut and the 1990 EU cut are available on VHS. The 1992 Trilogy cut was released on LaserDisc and VHS. The 2012 and 2016 HD versions were broadcast on AMC and streaming HBO respectively but neither are available on either platform anymore currently. The Chinese 1080p blu-ray on the high seas is probably the most accessible and affordable way to watch it, (albeit with terrible compression) and appears to be a Webrip of the 2012 AMC HD tv broadcast. It’s on two BD-25 discs with lossy Dolby Digital 5.1 audio and with subtitles for Sicilian dialogue.