Larry beat me to it! I was about to say that although it only existed under its original ownership from about 1975 to 1985, and it had a relatively limited catalog, the French classical label Astrée was so good musically and sonically (in LP form, at least) that it gets my top vote.
I was also about to give an honorable mention to Harmonia Mundi France.
Best regards,
-- Al
I was also about to give an honorable mention to Harmonia Mundi France.
Best regards,
-- Al