Apple Music is different because it uses ALAC not FLAC which actually sounds better, definitely a must-have service.
That’s only because Apple marketing makes you believe this. They are both lossless, up to 32 bits/sample and very high sample rates (FLAC allows even higher ones than ALAC afaik). The only “advantage” of ALAC is Apple ecosystem compatibility but that’s only for them to lock you in and make it harder for you to migrate.
It could sound better if they - for whatever reason - had access to better recordings, but that still doesn’t have anything to do with the codec.
That’s only because Apple marketing makes you believe this. They are both lossless, up to 32 bits/sample and very high sample rates (FLAC allows even higher ones than ALAC afaik). The only “advantage” of ALAC is Apple ecosystem compatibility but that’s only for them to lock you in and make it harder for you to migrate.
It could sound better if they - for whatever reason - had access to better recordings, but that still doesn’t have anything to do with the codec.