When comparing Nightingale vs Mellow Player, the Slant community recommends Mellow Player for most people. In the question“What are the best audio players for UNIX-like systems?” Mellow Player is ranked 31st while Nightingale is ranked 48th. The most important reason people chose Mellow Player is:
It is written in Qt so it requires less resources than a web browser or an electron application.
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Pros
Pro Nice Coverflow add-on
Pro Good library organization
Pro Highly customizable
Pro Skinnable
Pro Native
It is written in Qt so it requires less resources than a web browser or an electron application.
Pro AppImage
It is available as AppImage so you can easily try it.
Cons
Con Basically Abandoned
There hasn't been an update since 2016 as far as I can tell. The forum's dead, and the las blog update was in 2015.
Con QML
It written in Qt-QML which ignores all Human Interface Guidelines and make the app look like a web page.
Con Not native
It's using qt5-webengine which is not much different from electron / a webbrowser.