The difference is mainly that emacs with GTK support is basically the console version that runs with the same GTK theme as your system is using.
xemacs is emacs that runs in xwindows, but isn't gtk aware.

They should both have the same support.
I don't use emacs myself, as I found the keyboard commands confusing, so as far as how to get that support set up, I'm not sure.

Hey there knute. Thanks for the info. This question actually conerns the mac OSX port of emacs-gtk/xemacs through fink. Therefore, I would assume that the gtk version uses the aqua interface while the xemacs version doesn't? Or am I totally offbase?

Sorry, I'm not familiar with macs. or fink either for that matter, so I don't know.

Though, it would seem to me that if you had gtk set up to use a theme called aqua, the gtk version would use the same window decorations as the rest of the theme, whereas the xemacs would use the default xwindow setup.

Ahh, that makes sense

Fink/Fink Commander mac's response to apt-get and serves as a port of unix-based apps to the mac. Aqua is the name given to the mac GUI.

I'll take a stab at this, but I could be completely wrong.

Knute's onto something, I think, with xemacs using the X Windows default window decorations. Last time I used the X11 server under OS X, all of the X Windows had the Aqua theme. I'd be willing to bet that what Knute said would apply-- if you used emacs-gtk, it would have Gtk window decorations, and if you used Xemacs, it would have the default X Windows window decorations, ala Aqua's buttons.

So, I'd imagine it's the opposite of what you said in your second post.