Mine is Strawberry since it has a ton of options and plays a ton of formats. It's also (distant) fork of Amarok 1.4 and integrates well with KDE Plasma. I'm curious what other people are using these days. What's your favorite player?
I just have my music collection in Playlist and use Audacious to play them. All the music in the Playlist are saved in relative format so I can just copy the folders and keep the same Playlists
I ended up writing a perl script to generate a .m3u from a root music directory that shuffles all the subdirs so I can listen to full albums in random order instead of just tracks.
I did something similar except I wrote a C# program and used AvaloniaUI to build a cross-platform GUI. It was a project to learn C#. I have to make some updates to that now that I think about it...