There was a recently a review of Apple Classical in The New Yorker [1], which compares it to a few other services, some also mentioned in this thread. Apparently, many fare better on grouping compositions as an serious listener would appreciate.

I'm not sure if the other options own their own label(s), though. It will be interesting to see how this acquisition shapes the content available on the app.

[1]: https://www.newyorker.com/culture/cultural-comment/apple-aga...