After more than 15 years covering everything Apple, it’s with a heavy heart we announce that we will no longer be publishing new content on iMore and the iMore forums will be closing as of November 1st, 2024.
Adding a playlist is static, as in the playlist will be added with the songs in it at that moment.
Subscribing to a playlist is dynamic, as in the playlist will be updated from time to time, songs will be added and some songs will be deleted from that playlist.
You can "share" via a text message to everyone that you want to share it with, but they can only subscribe to it, they can't actually collaborate on it.