The main advantage I find is that I don't need to use the mouse to manage my windows. I split my screen to have my emacs session and terminal/browser etc., side

The main advantage I find is that I don't need to use the mouse to manage my windows. I split my screen to have my emacs session and terminal/browser etc., side-by-side. I can move the windows using key bindings: snap them, split the screen etc.,. Also extremely light-weight when compared to DEs like Unity/Gnome.