Higher quality audio files, especially now they're moving to FLAC which is open source and great quality. They give a higher cut to artists and the new music the algorithm promotes is slightly skewed against smaller artists as well(I think so anyway from my experience) so it's still same genre you like but you get to listen to songs your friends haven't heard but still good so you can show them, also supporting the smaller artists thru that. IMHO Spotify as a company is a shitcoin who use buzzwords like AI to increase their profits🤣🤣 I tried their AI DJ and it sucked imo