When comparing Kate vs Turtl, the Slant community recommends Turtl for most people. In the question“What are the best note taking apps for UNIX-like systems?” Turtl is ranked 1st while Kate is ranked 21st. The most important reason people chose Turtl is:
Turtl has applications for all the major operating systems, as well as Android. In addition, there are extensions available for Firefox and Chrome that cooperate with the downloadable applications.
Specs
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Pros
Pro Integrated terminal
Has a terminal that can sync to the location of your document, letting you compile or run your program quickly or run quick commands, all without leaving the editor.
Pro Project mode
Kate allows you to make projects to simplify the organisation of your code. This brings in additional organization of an IDE without the overhead.
Pro Fast and minimaistic
Kate is pretty fast and lightweight. This helps it with it's start up speed.
Pro Syntax highlighting
Kate supports syntax highlighting for over 180 languages, from Assembler to Zsh.
Pro Edit over FTP, SSH, or other protocols
Kate uses KDE's input and output libraries to read and write files, allowing seamless integration with FTP, SMB, SFTP, and many other protocols.
Pro Thriving plugin ecosystem
Lots of plugins allow Kate to expand or shrink based on your needs. It includes GDB integration, XML completion, and symbol viewing to speed up programming.
Pro By far one of the best and lightest text editors.
Notepads alternative (for the Windows users).
Pro Vi entry mode
Kate has a vi entry mode.
Pro Multiple Platforms (Windows, Linux, macOS, Android, Firefox, Chrome)
Turtl has applications for all the major operating systems, as well as Android. In addition, there are extensions available for Firefox and Chrome that cooperate with the downloadable applications.
Pro Open source
The app is licensed under GPLv3 making it open source. This means that anyone can use the code and contribute. This also makes it easy to use on one's own server or for company solutions.
Pro Good security
After assigning a password to your account in Turtl, a key is created to encrypt the entire account. No data is stored on their servers meaning they have no access to unencrypted content. This is a huge leg up when comparing to other Evernote alternatives.
Cons
Con Hard to install on Windows or OS X
Kate can be a little hard to install and configure, especially for beginners.
On Linux or BSD, it can be easily installed from your distribution's repositories.
Con No iOS app
While many other operating systems have a client, iOS does not have one yet (though it is planned).
Con No image embedding
Instead of image embeddings, there's a sort of poor man's substitute: image + description. If you add an image, you can create a description of any size and with all the formatting features. It can be used instead of image embedding but much more limited: only one image and only at the very top.
Con Internet dependent
Requires Internet connection to initiate offline mode, loses access to notes without Internet or server.