When comparing Lollypop vs Dopamine, the Slant community recommends Lollypop for most people. In the question“What are the best music players for listening to high quality audio (FLAC etc)?” Lollypop is ranked 15th while Dopamine is ranked 16th. 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 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.
Pro Beautiful
Can play FLAC too.
Pro Light, easy to use and looks good
Pro Fetch artist biography or lyrics
Pro Play by folder possible
Pro Can use your Windows 10 theme
Pro 2 visualizer to choose from
Pro Can display lyrics
Pro Miniplayer mode
Pro Built-in equalizer
Cons
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.
Con When track ends, next alphabetical track plays automatically, even when playlist empty
This app will continue to play unrequested music until you press the stop button.
Con Doesn't support Album titles that are shared among different artists
"Greatest Hits", for example, will be treated as a single, huge album with different artists' tracks and a single album cover that will be wrong for most.
