Agreed, cable is much much better quality. Not sure what the reason is though...
I've had a hard time finding out technical details of Apple's new w1 chips - what increased bandwidth they support, if any. This one case where Apple hiding the tech specs from consumers is pretty irritating.
I'm no audiophile pushing for nonsense like 24/192 downloads, but I do care about music enough to actively avoid overly-compressed audio via bluetooth or Sirius/XM as the sound is grating.
I'm thinking Bluetooth 5.0 will solve this quality issue, but I'm certain there is somebody with actual domain knowledge in this thread to enlighten.
Edit: link to some reference on bluetooth quality http://www.sereneaudio.com/blog/how-good-is-bluetooth-audio-...