This is a big question, and one which raises a few questions of priority. Do you want really discrete surround, are you more focused on performance quality, or audio quality more generally (or, more likely, given preference, which is most important).
The modern classical recordings which are generally considered unmissable are the recordings Julia Fischer did for Pentatone, and many of the recording Ivan Fischer and the Budapest Festival Orchestra did for Channel. Not terribly discrete but first-tier performances in native DSD recorded surround. These labels have a fairly excellent track record generally, as does BIS. Many of the orchestra labels are also good, but the sound from live recordings isn't as uniformly excellent as you can get from studio recordings. The performances also tend to be more variable in quality.
Of what you got, Rubinstein's final traversal of the Beethoven piano concertos is a really wonderful one, with occasional finger slips being more than compensated for by eight decades of living with this music and having a deep sense of its ebb and flow (Rubinstein was born in 1887). The quad sound is good but not particularly discrete, which I personally think meshes well with the autumnal playing. The Bernstein/Haydn disc is a surround extravaganza and lots of fun, as I recall - more typical of the very discrete Columbia mixes of the period.
There's a thread with more info here:
https://www.quadraphonicquad.com/fo...nded-classical-music-in-surround-sound.20662/
