Warner Bros

For the most part, the mono track available on the BD and UHD is fine, but there's an 8 minutes long segment which sounds terrible with artificially expanded frequency range causing very audible artifacting. The 5.1 remix doesn't have that issue. Sample

Shout! Factory 4K Blu-ray is more filtered than Warner Bros Blu-ray, although differences may not be audible.
(While the LaserDisc 2.0 is reportedly better clarity in dialogue?)

DV Plot. For those curious, the sculpture is still the altered one found on the re-issued DVDs, and previous Blu-ray.

5.1 audio on the Shout (either be 1080p or 2160p) was 16-bit, with more roll-off than the Warners one, the Warners was very similar to the NTSC and in terms of balance of the mix, while the Shout seems to be tinkered with, with the score at the beginning and at the end sounding worse on Shout.

Audio Comparisons: Slow.pics

For the regular commentary found on the NTSC DVD "Original Version" (there's no difference including the other NTSC DVD), Shout or Warners; the Shout commentary was just a bloated lossy transcode with some EQ. The best one was from either of the two DVDs.

Commentary Comparisons: Slow.pics

Now there's another commentary; it's basically the same commentary but has some parts different than the others, it can be found on EUR PAL DVD with subs for said commentary. The subs for it doesn't sync for the commentary #1 and vice-versa. Samples

Director's cut: 2007 WB Blu-ray; Arrow is a lossy transcode with dynamics compression.
2007 BD's AC-3 track with dynamic range compression enabled is nearly identical to Arrow's, see comparison

Theatrical cut is fine.

Both cuts are excellent in 4K. See caps

Warner Bros 2002 DVD has the best sounding mono

Hammer & Warner Archive 4K Blu-ray are confirmed by Randy Miller to be identical down to the encode, the only difference being different studio logos.

(no audible difference)

The EU disc from Universal has neutered bass.

4K Blu-ray Atmos track is much more compressed in all channels.

DE Turbine is similar in quality, US Warner Bros is worse (caps: EU vs US, EU vs DE)

The 4K discs have different color timing to the older master, see caps.

The 2012 DE Turbine disc is the master as the 2008 US Warner Bros, only with some sharpening and a layer of added grain.