Tidal has smaller library but higher quality (assuming your speakers allow you to tell the difference).
Spotify lossless support was added last year [1].
[1] https://newsroom.spotify.com/2025-09-10/lossless-listening-a...
Actually Spotify finally introduced lossless quality, after teasing it for something like five years!
I doubt you can listen to the difference, unless you really have golden ears.
We have been doing double blind test in HydrogenAudio.org for a while, and it shows most people won't notice (at certain levels of encoding).
https://hydrogenaudio.org/index.php/board,40.0.html