One good reason to learn Emacs is because other programs use Emacs keybindings too. You can use Emacs keybindings at a bash prompt, for example, or anything else using GNU readline. It's good to learn the basic movement and word/line deletion and undo/redo chords in Emacs so that you can use them in other programs. Your productivity will increase in those other tools even if you never use Emacs again.
I know Vim and Emacs, and Vim fits my brain and my habits better. But other people claim the same about Emacs. You never know for yourself unless you try. It doesn't take that long to learn Emacs well enough to see whether you're going to like it.
