Cornfedboy is right, there are a lot of threads on this. As a general rule, Harmonia Mundi, Reference Recordings, Delos, Telarc (some controversy here, as some don't like the Telarc spaced omni sound, which tends to lack the pinpoint imaging of other labels), EMI, Decca/London and more recent Teldec recordings are all excellent sonically; performances vary according to tastes. There are a lot of smaller labels and budget labels that come up with good offerings as well. DG, as Sugarbrie points out, and older Columbia/CBS are not up to the same level, particularly the older digital recordings, many of which are excrutiatingly bright. I don't like DG because what they do, generally, is stick tons of microphones in the players' laps, then rely on their mixing console and tonemeister to make a mix that sounds like the real thing. Plus, on the earlier recordings, there is very little deep bass--if you listen to the Bernstein Copland 3rd Symphony on DG, you would never know there was a bass drum in the scoring. The only low bass in the disc is the sound of Lenny bouncing around on the podium! Despite all that, some of their recent efforts sound fairly natural, which I find amazing. Anyway, take a look at the many threads on this and related topics, there is a wealth of information at this site.
