SQ difference between Air Play Lossless and Local FLAC playback?

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what lossless streaming services I can use on my iPhone to stream proper lossless music to my Moode audio RPI?
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I asked myself this question since a decade

Unfortunatly iPhone and Lossless are not "reconcialiable"

A time, best hope was bluetooth Apt-X but Apple won't implement it.
Apple wants you to buy captive products (airpods, apple tv etc.) on none of them handle real lossless (alac on airplay is downscale to CD quality as far as i know)

Bluetooth doesn’t really have the bandwidth for streaming lossless audio, the newer Sony codec is the best approximation but afaik it’s still not true lossless. 

The best solution is to have the Pi stream from the source like with Spotify connect. Unfortunately Spotify doesn’t have lossless still. Tidal connect would work but isn’t relevant for various reasons out of Tim’s control. There used to be a sorta dodgy way to get it working but afaik that doesn’t work anymore.

Upnp iirc requires a constant connection from device to pi so isn’t quite as useful and you can’t use the native interface like with Spotify/Tidal connect but at least it works.

AirPlay as it currently works is converted to aac before streaming to moode from an iOS device so definitely isn’t lossless but will now stream from Apple Music and let you play back at least some sources on your device without interrupting the music stream on moode sort of like the connect type situation. That seems more useful from a music discovery standpoint to me but ymmv.