Greatest hits usually get most of reprocessing of the original materials to match sound characteristics of one to another and therefore not on my list to demo.
Had LZ classsic records 180g pressing, but was not impressed compared to first press. It's definitely more quiet, but dynamics are sacrificed and makes me bored or is it just Led Zeppelin that I'm tired of listening to on all formats.
Small releases from the small record companies sound best to me:
CMP label: Charlie Mariano,Philip Catherine,Jan Garbarek,Bo Stief -- "October" on vinyl
Sky label: Irmin Schmidt -- Impossible Holidays on vinyl
WEA label german pressing of Carla bley's "European tour 1977"
almost ECM vinyls (especially german presses) are all great to demo.