Airplay is limited to CD quality (16/44) last I knew. According to ChatGPT, it is not limited to 320kbps, fwiw. Regardless, you can’t get what you’re paying for out of Qobuz or any high-res service. And its playback isn’t perfect. Furthermore, your phone is the player, which is problematic for many reasons and I suspect the phone may introduce degradation of its own.
I believe Tidal has caught up to Qobuz for quality since Tidal ditched MQA.
I have a Marantz Model 40n and I love it. It has Tidal Connect and Qobuz Connect, so it will play those services at full resolution, and it connects to them directly itself - your phone is just the controller, not the player.
@sextantcv4 Marantz is part of the Denon HEOS ecosystem, so you can add that to your list. With my 40n I’ve got a high (enough) end class A/B amp for my main listening and small Denon Home speakers around the house for whole-home audio. I feel this is superior to Sonos and Airplay.
With B&W 606 S2 mains my setup is perfectly adequate for my aging ears.