Is it true that ball mouse is more precise than optical one, and better for graphic design?
I really don't think so, I think that optical is better even for graphics. what are the con in scroll-wheel vs optical? maybe just the power issue. but if you really want the best mouse for everything buy a laser mouse.
IMHO this is the matter of personal preferences. You work with what you feel is better suit you. Some people prefer track-ball devices: essentially an overgrown mouse turned upside-down. You move the large ball, and its movements are tracked by the mechano-optical sensors. I personally never liked them.
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