When comparing Kate vs Geany, the Slant community recommends Geany for most people. In the question“What are the best programming text editors?” Geany is ranked 3rd while Kate is ranked 7th. The most important reason people chose Geany is:
Geany is very lightweight thanks to the smaller offering of features.
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 Light and fast
Geany is very lightweight thanks to the smaller offering of features.
Pro Built-in plugin manager
Geany has a built-in plugin manager which can be used to install plugins and add new powerful features to the editor.
Pro Quick search on large files
In Geany you technically search once for a whole search query, unlike Gedit, where once you start typing, the file is searched for in accordance with each substring of what you're typing, all the while leading to terribly annoying lag.
Pro Cross platform
Geany is a cross platform editor, very similar to Notepad++ in Windows.
Pro Build in terminal
Press F5 and code will run without the need to switch between windows.
Pro Actively developed Free (as in freedom) Software
This software respects your freedom.
Pro Real syntax parsing (not just coloring)
Hence it is capable of showing the methods and inner classes of, e.g., a Java source file.
Pro Simple project management
Pro Native
It is a real app and not another frankenstein web/electron app. This means it runs great and doesn't extraordinary amounts of RAM.
Pro Options in the menu are easy to find
For example, there is an easy way to change the font and theme in the View menu. No need to search through several syntax styles like in Notepad++ just to be able to change the used font.
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 Not very advanced
Although it has some IDE features, it is not as advanced as some other text editors that can be extended to contain IDE functionality.
Con Windows installer not digitally signed
Con Not many third-party plugins
Geany is not as popular as some other text editors with plugin support. As such it's understandable that it's missing lots of powerful plugins available in other editors.