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Historically, there has been little/no difference when 3B/2B transition over. Individually some guys will be better at one position over the other (Lopez at 3B and Ackley at 2B come to mind), but as a group skill-wise its a push.
Furthermore I'm not even sure if 3B is an offense first position.In 2011 3B in the MLB are hitting for a .700 OPS. Thats worse than any other position either than SS (.689). Worse than 2B, C, and CF.