In my experience with both (currently subscribed to both) Spotify is quicker to extrapolate from less information, and Apple is more patient and observes longer-term patterns. They both eventually get to my tastes, but I can more-rapidly alter the primary genres of my Daily Playlists on Spotify than I can of the various weekly playlists on Apple Music.
I like each for its own reasons, though if I had to choose one forever, I’d probably pick Apple, but it wouldn’t be by a landslide. :)
Had opposite experience with spotify. I used my wife's account one time, and played an hour of nature music. 3 of her daily mixes for the next several months were nature sounds, whale music, etc. No amount of playing other types of music seemed to have any effect. Was getting ready to shut the account down and retry (or move away), but it started to get better.
I regularly do a full data request from them, (and imo everyone should, never know when one day they’ll just delete all your playlists).
Would be cool if I import my detailed listening data from Spotify into Apple Music and basically pre-train their recommendations for me to conclude if it’s better/worse than Spotify’s.
I like each for its own reasons, though if I had to choose one forever, I’d probably pick Apple, but it wouldn’t be by a landslide. :)