Even though my favorite is Animals, I voted DSOM.
Here's a post on my 4.0, vs 5.1 experience:
"I finally had a chance to sit down and compare the Allan Parsons mix (Quad 4.0 “DTS” & 2 CH redbook CD) vs the James Guthrie 5.1 surround mix on the SACD.
Some scattered thoughts as I listen:
The running footsteps in “On the Run” were distinctive and strong in all four speakers as they ran from RF to RR to LR to LF (they fade in the LF) on the SACD, they fade in the LR and are barely present by the time they arrived at the LF.
The wonderful vocals in “The Great Gig in the Sky” by Clare Torry were a little more harsh on the Quad, but I swear I could hear the breath in her chest, rise and fall as she sang. Her voice was from “all over my head” vs “out across the front” on the SACD.
When she drops down to say “Who said I wasn’t afraid of dying?”, it was much more distinctive in the Quad version.
Drums on “Time” were four corners equal (more like the speakers were mounted on the corners of a four poster bed) with some nice diagonal interplay on the Quad, vs the rears coming in and out on the SACD - they are more “front heavy” here.
The opening vocals on “Money” seem weak or strained on the SACD where they were stronger (and the same) on 2 CH and the Quad versions.
I agree that the SACD version of “Us and Them” is like tepid water compared to the strong and distinctive AP mix. The SVS sub was present and strong in all three formats.
Overall, I have to give the nod to the Quad vs the SACD. Although the James Guthrie 5.1 mix is no slouch.
I like them all."