Their algorithm might not even be that different but there are just so many more people on Spotify that, if you have somewhat obscure tastes, its going to have more data to scrounge from to figure you out. They probably have ten? twenty? times the number of listeners as Tidal? Tidal always offers up the most expected, basic, tracks for me. "Do you want to hear Brown Eyed Girl by Van Morrison?" "NO!!! I love Van Morrison as you've noticed, but NO! I never want to hear that song again!" Whereas Spotify will dig up some hidden gem off of Veedon Fleece that I haven't heard in 15 years, and I'll smile and go about my day.Spotify's GUI and music selected for you algorithm are worth the extra coin. I'll definitely give the lossless service a go.