TDE (Trinity) vs KDE
When comparing TDE (Trinity) vs KDE, the Slant community recommends TDE (Trinity) for most people. In the question“What are the best *nix desktop environments not using systemd?” TDE (Trinity) is ranked 3rd while KDE is ranked 4th. The most important reason people chose TDE (Trinity) is:
Trinity is every customizable, almost every aspect of the GUI can be changed to look like you want. Need a button in the toolbar? You can add it. You want a specialized toolbar in a certain part of the screen? You can add it. You can configure the GUI in the setup before the first run too.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Highly configurable
Trinity is every customizable, almost every aspect of the GUI can be changed to look like you want. Need a button in the toolbar? You can add it. You want a specialized toolbar in a certain part of the screen? You can add it.
You can configure the GUI in the setup before the first run too.
Pro Low resource usage
Pro Traditional desktop experience
As a fork of KDE 3.5 Trinity is designed for Unix-like operating systems, intended for computer users preferring a traditional desktop model.
Pro Stable system that does not change everything every 6 months just for the sake of it
Pro Works fine on old computers
It is very responsive in 7+ years old computers.
Pro Looks like Windows XP
Pro Many themes by default
including themes that look like Windows 95 and Windows XP
Pro Looks old
Pro For conservative users
Pro Highly customisable
There are many customization options and possibilities to tweak the desktop, including widgets.
Pro Integrated components
Plasma Desktop generally comes packaged with a full set of applications to get users started, including a file manager (Dolphin), advanced file manager and browser (Konqueror), image and document viewers (Gwenview, Okular), the Calligra office suite, CD and DVD authoring (K3b) and dozens more. The desktop can be installed and used without these applications, but they add significant value for many people.
Pro Looks beautiful
The design of the three built-in desktop themes; Air, Breeze, and Oxygen, are very beautiful to some.
Pro Open source
Pro Has a file manager that provides a good balance between power and simplicity
Included file manager provides several icon, list and detail views to choose from along with features such as tabs, bookmarks, tagging, previews and metadata, network file access, bluetooth file transfers to/from devices and excellent removable storage integration while remaining fast and easy to use.
Pro Integrated advanced search
Plasma Desktop comes with an integration search system that makes it easy to find local files, emails, contacts, events and more. The file manager supports tagging and rating files as well as full-content searching and the KRunner command window and the Milou desktop widget makes searching for files, emails, applications and other content by name, subject, category, tag, fulltext, etc. very simple. It does this with essentially no noticeable interference with day-to-day usage of the computer, thanks to the scheduling built into the backend system (Baloo).
Pro Uses the Logo key (aka Windows key) for menu functionaly
Logo key is used for features such as the "start" menu, which will be familiar to migrating Windows users
Pro Keyboard friendly
Nearly all actions can be driven with keyboard commands. Window management, including effects such as desktop overviews, can be triggered with a keyboard control (or mouse gesture) and some even support filtering results (such as windows shown) by typing. The KRunner tool (default keybinding: Alt+F2 or Alt+Space) provides searching local files, online sources, unit conversions, math and more all from a keyboard driven interface.
Pro KDE is an evolution on the classic desktop model
KDE 4 is a great evolution on the classic Win95/Gnome/XFCE approach. It's moving in innovative directions while respecting the classic metaphors.
Pro Active development
Pro The session manager works perfectly
This is a much better session manager compared to solutions from other Linux desktop environments.
Pro Bunch of coherent applications
What make plasma so nice is the galaxy of apps, sharing same look and feel, configuration and behaviour.
Pro Adheres to standards
Standards adherence allows for interoperability and shared technology for X Window System desktops, with similar Wayland support being worked on. Applications not written with Plasma in mind work very well in Plasma as a result. The development team has also been instrumental in standard creation and adoption such as NETWM, X11 clipboard, icon themes, mimetype handling, application menu standardization, system tray protocols and notifications and more.
Pro Multi-Device "Convergence"
Plasma Desktop provides seamless "zero config" integration of your Android device with your laptop and desktop machines via KDE Connect. Phone calls, SMS messages, cross-device copy and paste, media remote control, cursor control and more are supported.
The technology that Plasma Desktop is built on, simply called "Plasma", also provides interfaces for phones, tablets, netbooks, and media centers in addition to the desktop. These additional interfaces use the same underlying frameworks and therefore work well together and have a unified feel to them. They also support a common set of applications across them which adapt to the input methods and screen sizes.
Cons
Con Slow development
Two years from one patch release to another and instead of fixing bugs it adds new ones.
Con Huge and obsolete codebase
Trinity is based in Qt 3, which is unmaintained by upstream. The KDE 3 codebase is also unmaintained. As new technologies like Systemd become a new standard the lack of developers make Trinity more incompatible and error/bug/security risk prone.
Con Ugly UX
Con Missing many modern features
Con Not supported on most Linux distros
Con Settings
Every now and then you might have to reset something. I had this happen a few times with the mouse setting for single click.
Con Looks old
The desktop and everything looks outdated and very similar to Windows 2000.
Con Perceived clunkyness and slowness
Compared to other options, KDE is still perceived slow. Especially, the desktop takes a few seconds to login.
Mouse pointer can feel sluggish, or laggy, on older systems
Con KDE is awesome but it is overcomplicated for newbies for sure
Way too many options for newbies to digest before the learning curve is over.
Con Interfaces are inconsistent and ugly in 4.x
While parts of KDE in 4.x can be very good looking, a common opinion is that the style is too hobbled together with inconsistent icons and styles clashing with each other.
Con HiDPI support is spotty
The log in screen as well as some other components of the OS do not scale properly under HIDPI. Everything in the log in screen will be displayed too small, as well as some areas of the OS.
Con Stability problems
Under certain conditions, most of KDE's components can be highly sensitive to race conditions, which leads to KDE applications frequently crashing, and, on rare occasion, kdeinit itself locking up.
Con Poorly named app menu with too many apps starting with "K"
This is better in KDE Neon with minimalist apps, which indeed in itself points out the problem.