As long as you have a paid subscription (9.99 or 19.99 for hifi) you have access to so much music it is incredible.
Downloading it to play offline is ridiculously easy although obviously it takes up storage space on a phone say, possibly a tablet may be better?
I did try Spotify and I guess I just got so used to Tidal I found its interface and search and play functions to be a little clunky although it seems the majority think it is Tidal that is inferior...lol go figure.
Do not even start with the huge debate raging over Tidal available MQA files, all I know is to my ears the sq is noticeably superior.