^ This. FLAC can get up to 60% smaller and I think has pretty good support for metadata.

But for listening the difference between 256Kbps-384Kbps Opus or AAC, and 16 or 24 bit FLAC/WAV is indistinguishable.

It's good for archival though as you avoid generational loss if you want to transcode your library to another format to use in your media server.