When comparing Pantheon Files vs pcmanfm-qt, the Slant community recommends Pantheon Files for most people. In the question“What are the best file managers for UNIX-like systems?” Pantheon Files is ranked 20th while pcmanfm-qt is ranked 36th. The most important reason people chose Pantheon Files is:
Pantheon files (like the Pantheon IDE) is very stylish and minimal. It's minimal and very easy to use. The most useful commands are there in plain sight, on the toolbar or the sidebar.
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Pros
Pro Easy to use
Pantheon files (like the Pantheon IDE) is very stylish and minimal. It's minimal and very easy to use. The most useful commands are there in plain sight, on the toolbar or the sidebar.
Pro supports natural sorting of file names
Dolphin and Deepin File Manager support it, too.
Pro Can open folder as root
PCManFM can open different folders as root, this way you don't have to use the terminal to move around files for which you need root permission.
Pro Simple
PCManFM is a very lightweight and simple file manager.
Pro Has a lot of features
... that only Dolphin, Krusader, Nemo & Nautilus has onboard -
but this one is a small footprint reliable friend.
Cons
Con Buggy
Was missing basic network connect features when Loki launched.
Con Not very advanced
Pantheon files (like Elementary OS itself) does not offer many advanced features since it's mostly aimed at beginners.
Con Unstable software, not a file-manager
really, really dangerous stuff.
Crashes and take your work/files into the nowhere - aware.
Con Not intunitive
In some instances it is impossible to create a new folder. There just isn't right-click option or icon for it anywhere.
Con Some operations are slow
Because it tries to be as lightweight as possible and tries to use very little RAM. This can unfortunately lead to it being slow sometimes.
