Emacs, for the following reasons: 1) Key chords/features have become a second nature. I've tried using Idea when working on legacy Scala/Java codebases and its

Emacs, for the following reasons: 1) Key chords/features have become a second nature. I've tried using Idea when working on legacy Scala/Java codebases and its Emacs compatibility mode caused a lot of frustration: enough key bindings implemented to make me forget it's not Emacs and then fall hard on my face when I tried using a more advanced Emacs-ism without thinking. 2) Latency. Again, tried using Idea and couldn't get used to the feeling of it being sluggish compared to Emacs. It's like listening to a low bitrate MP3 or something.