Trackballs can be efficient in the right application/environ
I've used both, but currently use a mouse with a great scroll wheel. The reason for a trackball in the past was a huge monitor that required sweeping movements of the mouse and then fine control once I got to the location of the design I was working on.--Soooo....what I would say is that for most folks, a mouse of some type is probably the most efficient, however for those that work with big documents or design on big monitors, the trackball can be a cool way to deal with all the real estate and yet still have fine control.
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