When comparing Terminology vs Pantheon Terminal, the Slant community recommends Terminology for most people. In the question“What are the best terminal emulators for UNIX-like systems?” Terminology is ranked 9th while Pantheon Terminal is ranked 17th. The most important reason people chose Terminology is:
Font size in Terminology automatically scales according to window size. When you resize the window, so does the text.
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Pros
Pro Scalable fonts
Font size in Terminology automatically scales according to window size. When you resize the window, so does the text.
Pro Looks smashing
Terminals are often very dull looks wise, not so with terminology.
Pro In-terminal video, picture and thumbnail support
Thumbnails, pictures, and videos can all be rendered in-terminal, based on the directory listing or mouse interactions. For instance, using "ls" on a picture folder will produce a list of thumbnails instead of only the filenames.
Pro Splitable
You can split windows, like in terminator.
Pro Visually customizable
It is very customizable in every aspect of the visual options.

Pro Integrates well with Enlightenment WM
Terminology is part of the Enlightenment WM packages. As such, it integrates really well with Enlightenment and other tools in the package.
Pro Block copy
You can copy text in blocks.
Pro Copyfree licensing
Terminology uses the Simplified BSD License. As it is a copyfree license, it tends to minimize license incompatibilities, legal compliance requirements, and various other complexities that may make it difficult to understand certain licenses.
Pro End process notifications
When a process has ended, Pantheon Terminal sends a notification bubble to the desktop notification server and indicates which tab generated the notification.
Pro Can easily restore a previous session
Pantheon Terminal remembers the window size, position, windowed/maximized/fullscreen state, and open tabs in between sessions.
Pro Advanced tab handling
Using the Granite Dynamic Notebook widget (which includes tab close history), double click the tab bar for a new tab, duplicating tabs, quickly closing all other tabs, auto-hiding/revealing tab close buttons, etc.
Pro Smart copy and paste
The keyboard shortcut for copy + paste is intelligently adapted andnbased on text selection and clipboard state. This makes it possible to use standard copy + paste shortcuts without colliding with standard ctrl + c behavior in the Terminal.
Pro Search feature
Cons
Con Configuration is sometimes complicated and non-obvious
There's a "Settings" menu for configuration, but more options there would make it easier. Downloading themes and extensions from the official repo would be a big plus.
Con No True-Color support
Not able to display a modern full range of colors, yet.
Con Scrollback is completely nroken
Scrolling back the emulator inserts random lines from other places in the scrollback buffer in between the actuall output lines. Thus it is impossible to see a correct copy of the previous output.
Con No scrollbar
The lack of scrollbar in Terminology makes navigation difficult. But you can use keys for it.
Con Too many bells and whistles
Some people feel that Terminology has too many features that are not suited for a terminal, but for a window manager instead. For instance, viewing thumbnails, watching videos and gifs, and other similarly flashy things just feel like eye candy and should not be part of a terminal emulator.
Con Heavy
Con limited customization options
Con RAM usage increases considerably over time
There is a RAM leak when using the Pantheon Terminal that adds up over time and use.
Con Incompatible with LTS Ubuntu
Pantheon is developed and binaries are released for a near blessing edge operating system (elementary OS). As such, installing it on an LTS Ubuntu system may be nearly impossible without replacing a large portion of the LTS stack that Ubuntu-targeted software expects.
Con Restrictive license
