See, I personally never understood SoundCloud … it’s completely opaque to me and I don’t understand how I would even begin to use it. I simply don’t get it.
But I also mostly use Spotify to listen to music I already know and sometimes get recommend stuff I like, but that’s not the primary function.
Maybe our music listening habits are just completely different? I don’t think there is anything wrong with Spotify or SoundCloud, I just think different people have different preferences.