When comparing UltraEdit vs Spacemacs, the Slant community recommends Spacemacs for most people. In the question“What are the best simple text editors for Windows?” Spacemacs is ranked 11th while UltraEdit is ranked 15th. The most important reason people chose Spacemacs is:
Spacemacs is just a well-configured Emacs distribution with community-sourced best in class plugins and layers selected to take the setup pain out of Emacs. Evil mode gives the Vim bindings and modes for fast editing, while Helm makes everything discoverable to make learning to be more productive simple and unintrusive.
Specs
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Pros
Pro Handles large files (>1GB) extremely well
UltraEdit has small memory usage and allows for fast parsing/searching when handling large files.
Pro Works perfectly with remote files
Supports several protocols for accessing remote files and working on them with the same ease as local files. Files can be integrated in the projects as normal files.
Pro Probably the most versatile general editor in existence.
If you need a general editor, UltraEdit is the way to go. If you were writing C/C++ all day, then this would be your editor. If you need to slog through large files then this is your go to editor. If you need to go through XML files, then this is your editor. If you need to sort data, then this your my editor.
Pro Fast, stable, easy to use
It loads with a short delay, but once loaded it's snappy and rock-solid. Anyone accustomed to using Windows text editors will feel at home in its interface, and those that prefer alternate keybindings can easily change them.
Pro Search and replace capabilities
From Ultraedit to Perl to Unix regex engines, the search and replace can accomplish just about anything.
Pro Responsive company
Whether for feature requests, technical support or license questions, IDM is always quick to respond.
Pro Nice hex display & edit
There's a handful of other features like this that make UltraEdit indispensable.
Pro Extremely customizable GUI editor
UltraEdit offer the best of both worlds. it has a full on GUI along with all the shortcut commands you need. There's no need for the user to suffer 80 char limitations of a terminal editor.
Pro Highly flexible
UltraEdit allows you to handle groups of files as a project.
Pro Preconfigured emacs distro
Spacemacs is just a well-configured Emacs distribution with community-sourced best in class plugins and layers selected to take the setup pain out of Emacs. Evil mode gives the Vim bindings and modes for fast editing, while Helm makes everything discoverable to make learning to be more productive simple and unintrusive.
Pro VIM Keybindings with EMACS ecosystem
EMACS ecosystem and language support is best in show. The EMACS is a great IDE that was in search of a good text editor. Spacemacs makes EMACS have a good text editor.
Cons
Con Proprietary
It's not free and a license costs $79.99.
Con The themes introduced in version 20 regressed certain aspects of syntax coloring
The themes simplified the syntax highlighting which lost the capacity to have as many colors as one wanted to define. Now it is limited to around 20 different colors. In general it's not a problem but in certain cases it broke coloring.
For some reason, the classic theme is the only one that is totally pleasant for readability well with syntax highlighting.
Con Emacs is slow
Emacs is single threaded which means that if you enable all the great features you might be used to from Vim, it will run noticeably slower which can be quite frustrating at times. There are efforts at a concurrent Emacs, but they don't seem to be going anywhere.