Original (and wrong to my later findings) statement -
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TIDAL BLOWS AWAY Spotify - it's not even close, especially not on a high end system like SONOS.
I'm making my way through building up my TIDAL library as we speak coming from Spotify (been using it for months though, TIDAL), and within 3 seconds it's a night and day difference; I have a Paradigm Millenia CT system I use for near-field listening w/ a few EQ adjustments via SoundSource (for near-field optimization).
Seriously, you'll thank yourself in the long run if you care about audio quality. Spotify DOES have a nicer interface w/ snappier response, and exceptional gadget integration. If they ever go full-on HiFi mode like TIDAL then I may look at them again, but until then I highly urge you to go TIDAL.
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I now take back all but like 10% of the above statements; Spotify either DID something, because I distinctly remember the day I tried Spotify again a couple months ago and it just simply sounded better. Far better than I remember. Not sure what happened. Could just be me.
Now, I literally just switched back to Spotify because Deezer is awful, and my TIDAL sub. ran out. I swear.... it sounds the BEST. Out of all of them. You're not gonna hear a big difference unless you go all out on a high end, well mastered recording on TIDAL. Spotify also compresses and decompresses using OGG Vorbis with an incredible quality sound quality restoration algorithm when it comes out for final playback - something I learned recently, and it's just.. fantastic.
So again, I'd personally say now: Stick with Spotify. Hope you didn't go all out with TIDAL - but if you did, you can't go wrong with it, but again, Spotify's great. I'm now won over again with them.