Apple Music and iTunes are lossless, high quality (often higher than a CD as they have multi-channel masters) and work offline, for example.
Is it? As far as I know, lossless is only offered for the Apple Music streaming service, but not for downloads from the iTunes store, which remain as 256K AAC files.
They both use the same app for playback, so this is a tad confusing.
Whereas the iTunes store downloads are a one time-purchase and have no DRM, so they're yours to keep.
[1] https://wiki.videolan.org/index.php?title=Advanced_Audio_Cod...