I have the MFSL and this my preferred format. Runner Up is the "Shine On" Box set version, which was remastered by Alan Parsons himself.
I also have the 20th Anniversary edition, but in the end. MFSL wins.
I've heard the SACD on a couple of occasions but the mix is off in places. I prefer the Quadrophonic Mix in 4.0 over the SACD release.
Related tidbit from an early 90's Guitar World interview with Parsons -
GW- I understand that you helped remaster the CD edition of 'Dark Side of the
Moon' for the 'Shine On' Pink Floyd box.
AP- That is correct. I received a call from James Guthrie, who became the
band's engineer after I left. He was supervising the remastering of the Pink
Floyd box, and he needed some technical information regarding those sessions. I
happened to be in the vicinity of the studio where he was remastering, so I
went down.
Basically, we discovered that the master tapes were in pretty good shape, and
all we had to do was add a little brightness to the end of the tracks. I felt
very pleased with what we did, and feel that the version of 'DSOTM' on 'Shine
On' is the definitive version.