classical music source

The knocks on vinyl are true, not many classical works have an obligato for ticks and pops.

That said, a good record on a well-set up TT, something as lowly as a Project Carbon Debut with an acrylic platter, Project speedbox, Ortofon blue replacement stylus for the red or A Nagoka MP-2-300 will sound more realistic than any CD or download at any price.

Here Here to great sounding classical vinyl when you can find it...My friend
brought over a Moblie Fidelity vinyl recording of Richard Strauss Also Sprach
Zarathustra and we were both stunned at how good it sounded. I don't think I
have a CD that sounds that good.

digital for sure, hi-res downloads when possible. The overwhelming majority of classical hires downloads (that I know of) are true hi-res; natively recorded in 24/96 or better PCM, natively recorded in DSD (like the excellent Channel Classics label) or hi-res PCM or DSD transfers from older analog masters. To me, these sound clearly better than CD's (given equivalent recording and mastering quality). I gave up on LP's a few years ago (right about the time many people were discovering or "re-discovering" them).

If one is talking about a kind of shootout for ultimate sound quality, then yes, the very best records that I have do indeed sound better than most, if not all of my digital classical music. But, these extraordinary records are relatively few in number in my collection. Also, a lot of the vinyl reissues of great sounding recordings are of warhorses that I really don't listen to that much. Many of the non-reissued records that sound good are quite difficult to find (e.g., records from the East German label NOVA). From a practical standpoint, aside from audio showcase recordings, digital recordings dominate the universe of decent sounding recordings that can be reasonably procured.

Perhaps where you live makes a difference.
Here in Twin Cities there are MANY places to hunt vinyl and
more classical fans than most American cities. Per-capita probably any American city.
I am happy to buy 10 used records and keep only one or two.