Which is better vi or emacs?

Editor wars are usually fought between the devotees of vi and Emacs, the two most popular editors on Unix (and Unix-like) operating systems. A significant portion of Unix users and programmers use one or the other of these editors. Many are familiar with both, at least enough to get around, and so feel they are well-placed to make judgment calls as to which is "better". Adding to this is the fact that both editors have a relatively steep learning curve, which means users have invested a lot of time in getting to know the editor they use.