The Sublime/TM/Notepad++ crowd cares about OS-native integration. I use Sublime frequently because after a solid decade+ living in OSX land, my fingers know how what to do, and neither vim nor emacs respect that without considerable massaging.
Vim fans want to use an elegant command syntax. I watch vim users code and always make a point to learn how to vim, eventually. The only reason I don't, is because I haven't.
Emacs users want/need the programmable, extensible runtime. Emacs is a programming language; particularly in Lisp development, Emacs often contains programs that are basic/standard parts of the toolchain and not found in other editors. I use Emacs because I like it, but more importantly, because I have to.
Combining the elegant syntax of Vim with the extensibility of Emacs, as well as some out-of-the-box support for the basic OS-native commands, is a very good start.