Sneaking a TOD in here:
Columbia. I got used to them because we were in the record club and I was getting a pretty good taste of their popular (Mitch Miller, Andy Williams), Broadway (South Pacific, Kismet, West Side Story), and classical (Bernstein conducting this 'n that - including, of course, WSS Symphonic Dances).
When I joined the RCA club myself to broaden my choices, I certainly liked all the music and the performances I was getting, but I never quite got the warm and fuzzies from the sound quality like I continued to get with Columbia. I was particularly thrilled with the Earl Wild/Fiedler "Concerto in F" album, no question about that.
Finally, I got to know London Records through the D'Oyly Carte stereo recordings from the late 50s and early 60s. I thought those were the Cadillac of record albums and lush sound. The only other one I had then was Sutherland's "Lucia" because that had just become a phenomenon.
So, with those qualifications, Columbia wins the TOD.
Even in my later record collecting years, I never got around to acquiring any Lyrita. Have to check a few out one of these days.