Emacs, because of Lisp. Vimscript is a bad language, Lua is a decent language, but if you need a editor/language that can be used to modify itself, there is nothing like Lisp.
I used to love vim, but it's just an editor and sometimes I want more. I decided it is worth my time to invest in a tool that has existed for decades and will be around for decades.
The dream honestly is Emacs to be replaced by another modern and streamlined editor, that is still as extensible and lispy as Emacs. The current iteration is weird and idiosyncratic, but the foundations it is built upon are timeless and way ahead than any other programmer's editor.