Yeah - with bluetooth, definitely there's much, much lower quality in some cases. Initially when trying cars I always used Android and bluetooth, and it gave me very bad impression of some of their audio systems. Then when finally bringing a cable for Apple Car play and using my partner's iPhone, the sound was totally different.
But it does also seem to depend on a car. Because I'm pretty sure I've had some very good experiences with bluetooth as well. And a case where bluetooth Youtube Music sounded good, and bluetooth Spotify sounded bad.
In addition both of these apps have different volume levels despite car having the same volume level, and Android has different volume levels compared to iOS, so all of it combined, testing around made for an annoying experience.
But it does also seem to depend on a car. Because I'm pretty sure I've had some very good experiences with bluetooth as well. And a case where bluetooth Youtube Music sounded good, and bluetooth Spotify sounded bad.
In addition both of these apps have different volume levels despite car having the same volume level, and Android has different volume levels compared to iOS, so all of it combined, testing around made for an annoying experience.