Aside from the pretty stellar algorhitm when it comes to stuff it suggests for you I really can’t think of any reason to use Spotify rather than Tidal. I tried Qobuz and Apple Music too, but didn’t like either.
I still have Spotify on my phone for older podcast-episodes (for new podcasts I use Pocketcasts), they’re often only there. But for that I don’t have to pay Spotify anything.