When comparing Papirus vs Flat Remix, the Slant community recommends Papirus for most people. In the question“What are the best icon sets for Unix-like desktops?” Papirus is ranked 1st while Flat Remix is ranked 2nd. The most important reason people chose Papirus is:
All icons look pleasing, especially with the Arc theme.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Sharp, flat, and fresh
All icons look pleasing, especially with the Arc theme.
Pro Familiar
Used on Lubuntu and BunsenLabs, for example.
Pro Active development
Pro Nice cohabitation with default icons
When an icon isn't provided by the theme, you cannot really spot it as this theme is quite close of the default with still a subtle and classy look and feel.
Pro Under GNU GPL3
Based copyleft license.
Pro Very large collection
This set contains icons for many file types that are ignored by other icon sets.
Pro Flat but with some depth
Cons
Con Under GNU GPL3
This limits the use elsewhere.
Con Contrast issues / No border around icons
It makes the the fast and makes it simple to add more icons(since you can simply scale them) however the contrast is lost in some situations.
Con No Ideas
It just copies the icon-syle from a different system.
Con Just another material style copy
Con Lacks icon for backintime
Backintime tray icon doesn't display on the panel because Papirus lacks the icon.
Con Under GNU GPL3
Limited use elsewhere.