What is the best text editor with the ability to create custom syntax? I used notepad++, but the custom syntax was a bit limited and the plugins (namely textFX) had a few bugs to satisfy me. I heard about Vim and Emacs (which one is better?), but I want a FAST editor with many features.
Vim and Emacs are fast and have lots of features, including syntax highlighting.
Personally I use Vim, but both of them are powerful editors. If you use Visual Studio the ViEmu plug-in is a very nice option as it allows almost complete Vim editing within Visual Studio.