I don't know much about the 30th Anniv. LP but I was lucky enough to hear the SACD-DSD Hybrid version in 5.1 at Phillips Crest National Studio in LA. They mass produced the DSOTM SACD's commercially. Crest's massive 5.1 Eggleston, Halcro, EMM system produced the best sounding multi-channel experience I have ever had and the sound was --flawless. Of course, the room itself was amazing and perfectly treated. That said, I also listened and compared the Anniversary SACD to several other copies I have on my two-channel home rig and clearly preferred the SACD 30th--especially for frequency extension, detail and imaging.
Regarding Parsons, the band chose James Guthrie with Doug Sax for the 30th re-master, feeling they would best preserve the original sound. The final re-master was done at Guthrie's Das Boot studio and by all accounts was extremely well received by Gilmour, the band and those at Astoria Studio --where the original recording was made.
Parsons was not happy about the decision reportedly, but the principles felt strongly about Guthrie's positive influence on the original master and so chose him for the SACD 30th master. In the end, the band themselves were the primary architects of the sound on DSOTM and felt Guthrie's lighter touch on the master would best preserve that. Based on what I hear I think they made the right choice.