When comparing Nuvola Player 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 Nuvola Player is ranked 42nd. 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 Mpris v2 support
Nuvola supports Mpris v2 which means that there's sound menu support in most modern Linux desktop environments.
Pro Creates a native-like front-end for music streaming webapps
Nuvola Player permits the use of music streaming webapps like Amazon Cloud Player, Google Play Music, and Spotify with an interface that aims to work as much like a native desktop application as possible. It currently supports 15 music streaming services.
Pro Can be run from the command-line
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 Strong focus on online
Streams are nice. But what about what I want and have? Strong focus on online listening. And if that is what you want exclusively, this is bloat. Better go with something really focused, functional and SMALL.
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.