Surprisingly, that's not as easy to answer as you might think. Each has plusses and minuses.

I've been using Apple Music mostly because I worked for them for a few years.

Spotify is my wife's favorite, but I find their playlists horribly redundant. They are also the worst at paying artists what they should be paying.

Tidal is for audiophiles like me. Non-compressed masters sound awesome. But they're pricey, and they don't have as much music as the others.

Amazon Music is ok, and it comes with Prime. I just find their interface a bit clunky.

This is probably more than you were asking for.