When comparing TextMate vs SlickEdit, the Slant community recommends TextMate for most people. In the question“What are the best programming text editors?” TextMate is ranked 18th while SlickEdit is ranked 24th. The most important reason people chose TextMate is:
TextMate has an extensive library of plugins which can be further extended to make it even more powerful.
Specs
Question Ranking
Pros
Pro Extensible
TextMate has an extensive library of plugins which can be further extended to make it even more powerful.
Pro Open source
Textmate is open source and hosted on GitHub.
Pro Multi line select and editing
Pro Lightweight footprint
It's lightweight footprint makes it extremely fast to load and use.
Pro Snippets
Pro OS X only (native)
Pro Symbol analysis support
There are powerful symbol analysis features in SlickEdit, including context tagging and references.
Pro Extensive support for programming languages
SlickEdit supports over 50 programming languages on nine platforms.
Pro Integrated debuggers for multiple languages
Integrated debuggers for GNU C++, Java, Python, Perl, Ruby, and PHP.
Pro Built-in beautifier
The beautifier formats code as you type to help improve readability and consistency.
Pro Compiler tools
Pro Over 13 emulations
Choose from fifteen keyboard emulations, containing the key bindings and behaviors necessary to emulate other editors (e.g., CUA, Vim, GNU Emacs, etc.)
Pro Multi-Platform
Windows, Linux, Mac OS X, AIX, HP-UX, Solaris SPARC, Solaris x86
Pro Portable mode
Possibility to set up a portable installation, to run on a USB drive for example.
Pro Scriptable
Write custom macro commands, functions, dialogs and tool windows.
Pro Easy access to XCode projects
SlickEdit opens XCode projects with no conversions needed.
Pro Third party tool integration
Pro Easy access to Visual Studio workspace
SlickEdit opens Visual Studio workspace with no conversions needed.
Pro Popular version control system
Cons
Con OS X only
TextMate is for OSX only.