When comparing Dolphin vs Samsung Internet, the Slant community recommends Dolphin for most people. In the question“What are the best Android web browsers?” Dolphin is ranked 18th while Samsung Internet is ranked 19th. 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 Can be installed on any Android devices
Samsung allows this application to be installed to non-Samsung Android devices starting with Android 5.0 Lollipop.
Pro Ad-blocking features
Samsung Internet supports Ad-Blocking features such as AdBlock Plus, AdBlock, AdGuard, Disconnect etc., but must be installed separately through Google Play, which these apps can also used in other browser which supports Ad-Blocking.
Pro Sync with Google Chrome desktop app
Samsung Internet can sync the bookmarks and history to Google Chrome desktop app, where the Samsung Internet extension for Google Chrome is available.
Pro Picture-in-picture (PIP) video
Samsung Internet supports picture-in-picture (PIP) video, which means the video that played in this web browser can be pop-out and visible in the Android screen even if the browser is minimized.
Pro Light and smooth + has chrome extensions
Pro Notifications
Samsung Internet supports web notification from various websites such as Facebook, Telegram etc. which it will also works even if the browser is closed.
Pro Clean GUI
Pro Do Not Track features
Samsung recently collaborated with Disconnect to include do not tracking features to prevent any websites to track with each other.
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 Has the filter bubble
Like chrome, samsumg internet tracks you and filters your searches.
Con Not supported by Password Managers
BitWarden and LastPass do not work with the browser.
Con No data saving mode
Unlike Google Chrome or Opera, Samsung Internet does not comes with data saving mode which is a disadvantages for users who relies on limited data usage.
Con Android only
Android dropped older iOS support after about SI 3.
Con It's Google
Data collector!
Con Only for Samsung Devices
While the competitors are vendor-agnostic, this browser is only limited on Samsung devices and can't be found anywhere else unless you pull the APK for the browser itself from the device.
