When comparing XMMS vs Mopidy, the Slant community recommends Mopidy for most people. In the question“What are the best audio players for UNIX-like systems?” Mopidy is ranked 33rd while XMMS is ranked 38th. The most important reason people chose Mopidy is:
Extensions permit the streaming of music from cloud services such as Spotify, SoundCloud, and Google Play Music.
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Pros
Pro Support for Winamp themes
XMMS is able to use any Winamp skin available.
Pro Simple and familiar music player
Many users should be pretty familiar with the interface as it has been built to match that of the popular Winamp player.
Pro Capable of streaming music from cloud services via extensions
Extensions permit the streaming of music from cloud services such as Spotify, SoundCloud, and Google Play Music.
Pro Many front-ends
MPD clients and HTTP extensions/clients can connect to your Mopidy server. Front-ends range from web front-ends, mobile applications, to even console clients.
Pro Available as a Docker file
Mopidly's Docker file can be found here allowing for quick setup.
Cons
Con Looks are dated and may be unappealing
XMMS is pretty long in the tooth now and it's design definitely reflects that.