Using AIMP 4 right now. When they released the final version, they added a dark theme which is easy on the eyes. I also love WinAmp, Foobar, and Musicbee. On Linux OS, I use Clementine or VLC (VLC probably going to be the one I chose most often due to folder layout). Musicbee doesn't have the best audio quality but has great themes and design. It's a favorite of mine actually. Only certain files seems to have poor audio. Never understood why.
When it comes to audio quality, stability, and low system resource usage, nothing beats WinAmp and Foobar. The feature I like most about AIMP 4 and Foobar is the folder layout instead of artist, album, etc. My music is not tagged well so folder view is a must or I'll never find the song I want. I can use Foobar to mass tag everything in a folder to work well on other players but it just seems pointless. How hard is it to just include folder view?... lol Editting the tags would mean reuploading everything to cloud storage. There is an add on type thing that you can use on WinAmp to add that functionality. A little clunky but it works fine. Too bad I forget the name of it.