When comparing File Manager Pro vs nnn, the Slant community recommends nnn for most people. In the question“What are the best Mac file managers?” nnn is ranked 6th while File Manager Pro is ranked 8th.
Ranked in these QuestionsQuestion Ranking
Pro Movie poster as file icons
It is kind of annoying to have tons of movies on the NAS, but having recognizable icons for the movies in a file manager can really help.
Pro Disk overview on click
You can know what's happening on your drive by clicking on a particular segment.
Pro Built in text editor
Sometimes a simple text file is just enough, being to open a text editor therefore can come in very handy. Be it to view, edit or generate a text file.
Pro Extremely lightweight (55 kb)
Pro Rich set of plugins
Pro Has a great wiki
Pro Minimal configuration with sane defaults
Default options and navigation is simple to grasp.
Pro Unique navigate-as-you-type mode
Pro Awesome new features being added in every release
Pro Integrates with the desktop environment and opens files in the default applications
Save and resume sessions.
Pro Supports cd-on-quit
Allows for quick switching between nnn and the terminal.
Pro Reasonably well-documented
However, it requires some prior knowledge of inner workings of Linux and there are no tutorials (yet). NNN author is making up for this by actively responding to GitHub issues.
The file manager has recently added support for preview hovered files using various methods.