The question still remains, what is the best version of any particular recording? To say that the DGG Bernstein Mahler pleases you more than a remastering of the Columbia version does not quite address the issue.
If the best contemporary sound pleases you, what do you do with any performance from an earlier era? By this logic if I like the sound of the 20XX performance by Z best, what happens to the artistic achievements of any earlier time?
The goal, I would imagine, is to present the most convincing sound of any recording so we can access the performance. If, say, the Bernstein Columbia Mahler 3 were a more complete performance overall, would we set it aside because the latest Gilbert or Stenz seems a bit better in sound?
This is both a philosophical and an esthetic discussion.
Many listeners find the Schnabel Beethoven sonata series from the 30s to be the most compelling and revelatory. Should one say that pianist W's version from 2012 has "better" sound on my system and therefore let Schnabel fade?
There are too many pristine and sterile performances around for our own good. The life of the music, even when sound is less than ideal, is the thing.
The letter killeth, but the spirit giveth life.
Best to all,
Tom in Vermont