For what it’s worth, Apple Music sounds better than Spotify, at least from listening to both back to back.
Apple Music vs Bluetooth, I am not as confident. Hi-Res on USB still sounds better, obviously, but I am not hearing the compression as much which is nice.
I tested all three with Sultans of Swing - Dire Straits and other songs that I have in hi-res. There’s a lot of stuff that the mastering is subpar anyway so it will not sound much better one way or the other.