I have both. Spotify has a better selection but Tidal integrates to Roon and that is the most important thing for me. I have many great playlists I get from Spotify. I use soundiiz to convert my playlists to Tidal. Spotify is fine for casual listening but I would never sit down and really listen to something on it, the difference in sound quality is major especially when comparing Tidal via Roon
Tidal vs. Spotify
Tidal sounds better for sure. Search functions aren't as good as Spotify but if you are currently using Spotify, give Tidal a try and let me know what you think!