When comparing aqualung 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 aqualung is ranked 35th. 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 Gapless playback
Aqualung offers continuous, gap-free playback of consecutive tracks. Your ears get exactly what's in the files – no silence inserted in-between.
Pro LADSPA plugin support
You can use any suitable LADSPA plugin to enhance the music you are listening to. There are many different plugins out there, including equalizers, spatial enhancers, tube pre-amp simulators, etc.
Pro JACK Audio Server support
Pro Multiple skin support
There's support for multiple skins in aqualung; changing them is possible at any time.
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 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.