[jpiasetz]

Any reason you would think more people use the GUI version?

Although I obviously have a biases sample but everyone I know uses the shell version of both. The people I know who use the GUI use other editors.

[niggler]

OS Integration -- copy-and-paste works better, scroll works predictably (there are quirks in OSX terminal using mouse mode in vim and in emacs), sensical full-screen mode

Advanced features -- Certain things can't be done with the terminal. For example, Aquamacs lets you see inline latex previews: http://aquamacs.org/latex.shtml