According to lddb.com, the Thorn EMI LaserDisc (the one that has the “Chace mix”) only has an analog audio track:
https://www.lddb.com/laserdisc/30336/2535/Terminator-The
That explains why, in the project discussed in this thread, it was an analog capture instead of a digital rip.
That means that the best available source of the Chace mix is VHS Hi-Fi or Betamax Hi-Fi, both of which are superior to LD analog audio, or at least they are on paper. As for the Thorn EMI Betamax release, I’ve looked at a picture of its sleeve, but it doesn’t seem to say “Hi-Fi” on it anywhere. Its sleeve is practically identical to the VHS sleeve, except, in the spot where the VHS sleeve says “Hi-Fi”, it has the catalog number instead:
So if the Betamax release isn’t Hi-Fi, that leaves VHS Hi-Fi as the [theoretically] best quality source. And even if the Betamax release is Hi-Fi despite not being labeled as such, it would only be ~equal to VHS Hi-Fi, with any significant differences there may be coming down to the other variables involved.
Thorn EMI also released The Terminator on CED VideoDisc, which presumably has the Chace mix as well…
https://www.lddb.com/ced/01755/TE16340/Terminator-The
… but I don’t know anything about the sound quality of CED.