When comparing Rhythmbox vs Lollypop, the Slant community recommends Lollypop for most people. In the question“What are the best audio players for UNIX-like systems?” Lollypop is ranked 12th while Rhythmbox is ranked 22nd. The most important reason people chose Lollypop is:
You can view all the albums you have in one long list. Clicking on one of them will bring a popup at the bottom of the screen where you will see a list of all the songs on that album.
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Pros
Pro Loads of features
Rhythmbox allows you to extract CDs to MP3s while listening, and you can also burn CDs from playlists. You can listen to Last.fm and podcasts through Rhythmbox, which has support for lyrics and more.
Pro Plugins add only the features you want
Rhythmbox has built-in support for first and third party plugins. Instead of adding a bunch of features not everyone will use, you can download just the plugins that you want.
Pro Podcast management
Rhythmbox features built-in podcast management.
Pro Pre-packaged!
Rhythmbox comes pre-packaged with distros like Ubuntu, so you can just start listening to your favorite music - no apt-get install
!
Pro Internet radio
Rhythmbox has built-in support for users so that they can add their own streaming audio / internet radio channels.
Pro Reliable
Pro Good organization
Music can be browsed by the usual artist and album, but Rhythmbox also allows for genres which aren't supported by all music players. It also has a very useful queue box.
Pro Super intuitive way of organizing and browsing albums and artists
You can view all the albums you have in one long list. Clicking on one of them will bring a popup at the bottom of the screen where you will see a list of all the songs on that album.
Pro Works fast and reliably
Pro Super flexible layout
The latest version has a good full-screen layout and is very responsive. Goes very smoothly from full screen to minimal player (also being a GTK+ app).
Pro Integrates with the MPRIS sound menu
This applies for most players in the "Linux world", but not for all. Therefore I consider it worth mentioning.
Pro Huge development
There is constant improvements, librem and gnome3 is possibly the future.

Pro Cloud music
Lollypop allow you to play music from the web (iTunes charts and search from Spotify).
Pro Integrates well with many desktop environments
One example being the conditional use of client side decorations (a.k.a. header bars) depending on the currently active desktop environment.
Pro Good party mode
Pro Clean, light and works very well.
The only one that can play a lot of files without to stop.
Pro Queue option lets you change what's playing on the fly
You can add songs to a queue, and then re-order or remove songs as you please. It works similarly to a temporary playlist.
Pro Online radio integration
The newest version features a nice interface for adding, browsing, and playing online radio stations. This gives you access to more music than you would normally have, which can help expand your music library for free.
Cons
Con Buggy and slow when there's a large music collection
Can't cope with a large music collection.
Con Not crossplatform
The only bad part of RhythmBox is that I cannot install it on other OS's.
Con No album artist field
Most other modern music players come with an Album Artist Field when sorting music. Collaboration is very common these days and often a song would feature multiple artists, but sometimes it's easier to just sort for Album Artists. It's a rather simple feature, yet Rhythmbox has repeatedly shot down its users for making that request.
Con No folder browse/add-to-playlist view
So few music players seem to let you browse by your directory structure and add songs to a playlist that way. That's unfortunate because it's a really useful feature and eliminates the problem of mistagged music.
Con Still no built-in equilizer
Rhythmbox has been around for a good while now and yet there is still no default built-in equalizer. An equalizer allows users to tweak the audio to their preference. It can also help compensate for hardware (for example, lots of headphones are bass heavy, but to get a more balanced sound an equalizer can tune the bass down a touch).
Con Crashes often when there's a large music collection
Con No CUE file support
Con GTK App
Its a GTK app so integration in other desktops is terrible it also uses GNOMEs ClientSideDecorations so it will break many window managers.
Con No equalizer
Lollypop still does not have an equalizer.
Con Good party mode
Con No In-App Volume Control (0.9.242)
It has no in-app volume control, it has to be managed through system 'Sound control/Applications'

Con Requires a well organized music collection
Lollypop will be a pain to use if music is badly tagged. The setup is a one time thing, but it can be a pain to organize a large library.
