Vim: Clearly evil, lightning fast. Relies on vimscript for any interactivity and can barely be used outside of the editor.
Emacs: the hippie brain child of some of the brightest minds at the MIT AI lab, funded by military contracts. Slow, but uses a near-universal language that can easily escape the bounds of the editor, (and often does (, and holy shit where did those parentheses come from. (Oh no, it's becoming self-aware - fly you fools....!
Vim: Clearly evil, lightning fast. Relies on vimscript for any interactivity and can barely be used outside of the editor.
I don't know why you want use Vimscript for anything outside of the editor. But if that your issue, then there is Neovim. It uses Lua instead Vimscript, but what is the benefit of using Lua outside of Vim? That changes nothing.
Lua outside of Vim has huge applications in embedded products. Dude I would kill for Lua. Do you know what we have? Common Lisp. Yeah, it's great and fancy and all, but try adding that to your CV and applying for an embedded system job.
My point is, then use Lua outside of Vim. What does this have anything to do with the language used in Vim? You can use Vimscript in Vim, and still use Lua outside of Vim. So what's the problem? It's not like Lua gets available to you outside of Vim, just because you switch to Neovim. What do I miss here?
(it was mostly a joke, but) the skills you acquire tinkering your Vim to your needs using vimscript can't be used elsewhere, whereas Emacs has the (small) advantage that at least most of one's elisp skills can be translated to common lisp quite easily (with the joke being that common lisp really isn't that useful, hence my Lua jealousy rant).