Quick Answer. Although which service sounds better may be subjective to some, Tidal provides higher quality masters using lossless files, whereas Spotify streams music using an AAC lossy format. If you intend to use lower quality formats to reduce data usage then Spotify may be better the better option.

https://tidal.com/browse/playlist/991683e8-b504-4556-a997-664ca5edcc54

https://tidal.com/browse/playlist/991683e8-b504-4556-a997-664ca5edcc54