CarPlay!... I’ve yet to see anyone have an issue with Spotify and CarPlay, I think it works fine...
Apple does not have more music for everyone..... and it’s interface is so plain and dull and I have to say, not as easy to use. I’d also seriously question your claim on the sound quality as I’ve used both extensively and have not heard a difference! Bonus with Spotify is being able to select more quality options.
Are they both good? Yes, but I’m sorry when I like my dance music, I get tired of Apples persistent suggestions of old 90’s pop music! Not what I’m into really..
Spotify for me has a better interface and much better music selections. So I’m afraid it is still the deal breaker for many many users.
Oh and let’s not forget, Spotify can be FREE if you want.