Well, haven't found anything on Spotify that I can't get on Tidal (the same things appear to be missing on both, with a couple of exceptions, all in Tidal's favor with one glaring exception -- Prokofiev complete piano music by frederic chiu, which has been on and off Spotify). Add to that the lossless compression, and I'm switching. Only thing is, I can't get Tidal at work, so I'll probably allow a month or two transition before I quit.
Something I haven't checked yet -- is there a way to add local files to Tidal? I keep forgetting to check that when i'm at home.