Vertigo's new BD is supposed to have the mono in standard DTS but it may be just a folddown like the 2008 DVD. The mono track as is is very worn and seems to be the same track from the analog 1985 LD. (I think. Don't have it to compare.)
Jaws I have on the 1991 laser and it sounds spectacular, betters the cleaned up mono on the 30th aniv. DVD. However there is some replaced music and effects on this LD that should be fixed on the Signature edition.