When comparing Guake vs cool-retro-term, the Slant community recommends Guake for most people. In the question“What are the best terminal emulators for UNIX-like systems?” Guake is ranked 11th while cool-retro-term is ranked 18th. The most important reason people chose Guake is:
You can hit F12 (by default, though it's customizable) to open a terminal overlay, Quake-style, as a drop-down from the top of the screen.
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Pros
Pro Drop-down terminal
You can hit F12 (by default, though it's customizable) to open a terminal overlay, Quake-style, as a drop-down from the top of the screen.
Pro Supports transparency
Transparency is particularly useful for when you need to refer to the information displayed by application under Guake window.
Pro Hotkey support
Guake is very fast and easy to open with a customizable hotkey, meaning there's no fiddling with menus or icons.
Pro Extremely customizable
Guake's appearance is very customizable: from the transparency to the width and height of the window. You can also choose which key to use for toggling the terminal window.
Pro Available in many popular distro repositories
Guake is available in a lot of repositories for the most popular distros. This makes it very easy to obtain and install on almost any system.
Pro Shortcut key F12 can be used to toggle
The global shortcut key, F12, can be used to easily toggle the terminal window.
Pro Tabs support
Guake supports tabs, while working with them is very easy.
Pro Can choose byobu as shell
You can choose byobu as shell, by adding a line to /etc/shells : " /usr/bin/byobu"
and get guake with byobu ... sweet!
Pro Mimics the look and feel of the old cathode tube screens
Cool-retro-term mimics the look of old cathode screens. This is just aesthetic, but great for people who want a more retro feel.
Pro Good rendering
If you disable every special effect and the framing, the rendering is actually quite comfortable and readable making a good terminal option if you have CPU cycles to spare.
Pro Good fun
For simple tasks this is wonderful - anyone seeing it will love it, takes me back to using the Commodore Pet in college in the early 80's.
Pro Available in multiple repositories
This terminal is available for download from repositories in all the most popular distros, making it easily available.
Cons
Con Not cross-platform
Linux only, and additionally targeting GTK3.
Con Not very responsive
Occasionally, Guake slows down and is not very responsive.
Con No font ligature
Guake uses vte for its terminal emulation, and vte simply doesn't support font ligature (yes, it's 2019). This is what its maintainer thinks about it.
He really thinks supporting font ligature breaks terminal's grid, like he doesn't understand a font that's monospace is a monospace no matter if it has ligature or not.
Con Not very practical by today's standards
While it certainly has an aesthetic feel, cool-retro-term is nothing more than a cool trick if you want to play around. It's not very useful in this day and age.
Con Extremely heavy and impactful on resources
A massive amount of resources are used as graphical processing in cool-retro-term. They are ridiculously heavy for the terminal's intended use.
Con Large dependency on kde
It looks like many of the effects present here are provided by more or less stock kde effect libraries. For Gnome-based systems, installing this will pull in a large handful of kde libs.