I use two emacs (Aquamcs and text based emacs) on my Mac. I normally use text based emacs for just editing something, so I don't want to load anything with it.

What I came up with is to have the checking code in .emacs to exit/break if it's text based emacs (darwin system but not aquamacs).

 (when (and (equal system-type 'darwin) (not (boundp 'aquamacs-version)))
     (exit) ??? (break) ????
 )

It seems to work, but I don't know how to break out of .emacs. How to do that?

ADDED

I just wanted to speed up in loading text based emacs on my mac, and I thought about breaking out as a solution. Based on the helpful answers, I came up with the following code that runs .emacs only when it's not a text based emacs.

(setq inhibit-splash-screen t)
(unless (null window-system)