When comparing Pantheon Files vs Insight, the Slant community recommends Insight for most people. In the question“What are the best GUI file managers for UNIX-like systems?” Insight is ranked 15th while Pantheon Files is ranked 18th. The most important reason people chose Insight is:
It has full ZFS support including snapshots.
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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 Full ZFS support
It has full ZFS support including snapshots.
Pro BSD 3-Clause
Its written under a real open license without copyleft.
Pro No toolkits
It does not use freedesktop toolkits like polkit or dbus. It also does not use toolkits from other desktops like GNOME(GTK, ATK, GLIB, GIO etc.) or KDE(KF5/KIO).
Pro Based on Qt
As Qt is a real multi-platform toolkit that is not developed for one desktop and platform.
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.