Because it's designed to be extremely minimal, Radio Tray is extremely easy to use. The entire UI consists of a dropdown menu where you can hover over the genre you wish to listen to, and then you can choose a specific radio station to listen to.
It completely sucks in library management. Several files are missed, files are merged (you get 2 "same" tracks in the same folder, a 16bit, and a 24 bit. If metadata is not found, it will not be added in the library. Most freeware products does that job much better.
Apple Music is tied into iTunes. Apple Music is a subscription service that allows you to stream and/or download unlimited songs. This can be significantly cheaper (and more convenient) than buying albums/songs individually.