Update 2016-07-02: Link to article by Christopher Patti
The editor war between users of the vim editor and the Emacs editor exists since decades. Here is my comment on that as somebody who is using vim and GNU/Emacs intensive on a daily basis.
In my opinion, the most dominant advantage of Emacs is that it's not just an editor: it's a LISP interpreter and thus a very capable highly dynamic platform.
The consequence of this fact is dramatically: Emacs runs a very large number of third party packages. Those packages provide top-of-the-art features for editing but also for non-editing stuff like file management, games, project management, email management, calendar, data processing and visualization, version management, spreadsheets, drawings, or even composing music.
Other "editors" do offer some few non-editing features as well. However, only Emacs is even used by people who don't need an editor at all. Org-mode is an excellent example of functionality which has almost nothing to do with editing per se and whose enormous capabilities are not matched by any other software solution.
Apparently, the well known quote "Emacs is not an editor, it's an operating system" is not just a funny phrase to make you smile - it's simply the truth. People like John Wiegley (and many more) are not using much operating system features or other software at all. They basically "live" within Emacs only. They've added another abstraction layer on top of their classic operating system. This does provide great abilities whose benefits can't be understood by most people unfortunately. It's impossible to explain colors to people who can not see (yet).
So: comparing Emacs to an editor is like comparing GNU/Linux to a word processor. It's an unfair and inadequate comparison for both sides. Those stupid editor flame-wars are not worth the time at all.
If you need only an editor, great power-tools like vim are fine as well. Don't complain that Emacs can be so much more than just an editor.
Simply use the best tool for each job deliberately.
Also interesting to read: Vim Versus Emacs - Minus the Religion by Christopher Patti.