Jaws- Mono on 2005 DVD is a tad crisper than mono track on BD and lacks ‘flaws’ that the latter has. Mono track on mid-1990’s LD has certain dialogue/effects that are more present than those on the mono tracks on the DVD/BDs.
The Terminator- Mono on Image DVD and LD is better sounding than Mono on MGM DVD. Sound effects are much louder and beefier on the Image releases. However some effects differ between the two.
Frankenstein- Restored VHS and LD sound best though they lack the restored ‘God’ line. 1999 DVD has audio heavily DNR’d while a more flat and a tad muffled sounding track is used on the 2004 DVD and carried over to subsequent releases including BD.
Halloween- Mono on 35th Anniversary BD and 40th Anniversary UHD is a downmix of the surround track, not the original mono. 2007 BD as well as the 35th Anniversary BD included in the deluxe set with all the films has the correct mono.