When comparing Dolphin vs GNOME Files (Nautilus), the Slant community recommends Dolphin for most people. In the question“What are the best file managers for UNIX-like systems?” Dolphin is ranked 3rd while GNOME Files (Nautilus) is ranked 17th. The most important reason people chose Dolphin is:
As with any KDE app, Dolphin, allows adding or modifying toolbar buttons and keyboard shortcuts.
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Pros
Pro Immenseley configurable
As with any KDE app, Dolphin, allows adding or modifying toolbar buttons and keyboard shortcuts.
Pro Can split views
Dolphin supports splitting the view in two navigational areas, this way you can navigate two different directories at the same time.
Pro Integrated terminal
Pressing F4 with any opened folder on a mounted path opens a console within dolphin.
Pro Also has a refresh option
Dolphin is without a doubt the best fully functional and easy to use and multitask with.
Dolphin also has a refresh button which no other File manager has. It's great for tracking a large files transfer; that's what file managers are for - good common sense.
Pro Easy to extend with plugins
Dolphin follows KDE's philosophy of being extendable and configurable. It can easily be configured and customized through plugins.
Pro Auto mounts flash drives
Dolphin automatically identifies and mounts external flash drives.
Pro Fast at opening graphics folders
Pictures with or without previews is optional and selectable at the touch of a button.
Pro Does not use third party libraries
Unlike all those GTK-based file managers it does not have to rely on external written software for its functionality because KF5 is KDE SOftware and developed alongside.
Pro Keeps its state
It starts with last opened folders.
Pro Fully supports HiDPI
Supports HiDPI displays.
Pro Automatically centers items
In icons view mode, the space between files gets stretched so that there is never and annoying empty space at the right side of the window.
Pro Minimalistic looking
It does what it is supposed to do, and leaves a lot of screen space to look for a file.
Pro Widely supported
The program is distributed as a single source archive, which can be configured, compiled and installed on almost any Linux flavor. There are no binary files for a specific Linux distribution, but you can install it directly from the default software channels of your operating system.
Pro Easy to use and familiar user interface for Ubuntu users
The user interface of Files is very familiar to Ubuntu users, most probably because Canonical still uses Nautilus (an old version of it) as the default file manager for its world’s most popular free operating system, Ubuntu Linux.
It split into two parts, a sidebar and the main file viewer. While you already know what the latter can do for you, the sidebar offers quick access to Places, Devices and Network locations, as well as any other bookmarks that you can add whenever you want.
Pro Allows you to access remote or local locations
On recent versions of GNOME, you can click the Files entry in the panel to access a specific location (remote or local), connect to a certain server (FTP, SFTP, SAMBA, etc.), access your bookmarks, open a new window, as well as to change its default functionality.
Pro Quick file preview
GNOME-sushi allows you to quickly view files without opening them. It supports most audio and video formats, but support for more can be added.
Pro Wayland-native
Can run under Wayland without XWayland.
Pro Supports natural sorting (not on all distros)
Dolphin, Deepin File Manager and Pantheon Files support this, too.
Pro Nautilus action configuration tool can configure systems in ways no other FM can
It can configure popup menu depending on file type.
Cons
Con May be a little slow on startup
Dolphin can be a little slow on startup (depending on distro, hardware etc...). Startup time can vary from a couple of seconds to up to a minute.
Con Can hang on remote file systems
It doesn't cope well with remote file system nicely like sshfs or any samba, like when network is not responding/very slow. It just hangs.
Con "Type" column too verbose
Despite having a large enough monitor, if you keep the size of the browser window small, the "Type" column (in "Details" view mode) insists on including the complete multipart MIME string, making the column so wide that trying to limit its width makes the column useless. Sorting by "Type" renders the list into an incomprehensible mess.
Con Poor optimization on later versions
Con Too simple
Feels weird on KDE because it has less customizing options Konqueror and any other KDE app have.
Con Can't perform ROOT actions
Developers set a constraint in Dolphin that deny Dolphin to run with root permissions. Hence, if you want to perform an action that require root permissions, such as rename a file in /etc/ folder, you are forced to use terminal or switch to another file manager.
Con It has lost so much functionality
As already stated, this is not well configurable anymore. One can not even start in dual pane mode for cut/copy and paste. Just a ridiculous transgression. It was great just 1-2 years ago, but over-simplification in this case is detrimental to functionality.
Con Mostly unconfigurable
There are not many ways to configure Nautilus to fit your needs. Besides what can be seen in the settings button you can't configure it further.
Con Outdated
It is not updated frequently and Ubuntu could stop using Nautilus and switch to Nemo.
Con Awful date modified column.
It should list by full year month day, no matter whether it was today, last month or years ago. Displays wrong time modified for photos I took and downloaded today (not exif time taken and not anything that makes sense). Not customizable in any way one would expect.
Con Has/had memory leaks
Sometimes about 600MB of RAM goes somewhere...
Con Forces you to constantly swap between mouse and keyboard
Con Slow at moving picture folders
A move, even to the same disk, can take a minute for a folder containing a hundred images.
Con Can't right click in list view mode with a long file list
If the file list is long enough to fill the screen, then there is no empty place to click for bringing the context menu. Need to change the view to Grid view, then right click.
Con Still does not remember per folder view
This is the last missing feature that was removed long time ago and makes Nemo competitive. Should be reimplemented remembering view type and icon size folder by folder.
Con Creating sub-folders within full folders is not possible anymore.
In order to create a new folder within another folder that is full to the bottom of the page, we must create a folder in an open area somewhere else, then move the sub-folder into that full folder. Even worse, we need to use the "Move to..." option, with so many extra clicks, instead of just being able to copy and paste as before.
Con "+ Other Locations" is a stupid change
"+ Other Locations" in the left pane now forces us to click twice or more in order to access additional drives, even the local "Computer." Having all of the drives listed on the left side was quick and easy, and the drive "Properties" were available just by right clicking once, although drive "Properties" is no longer available when clicking on "+ Other Locations," then right clicking on the drives.
I still use Debian 8 for the older Nautilus, even though the developers already damaged that older version as well. However, Nautilus is completely useless to me now in Debian 10 so I am seeking for a new graphical desktop to replace Gnome and Nautilus...I am fed up with the developers.
Con Has too many bugs
There are too many bugs at the current state for this file browser to be usable.