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Agreed. Alvarez struck out twice as much as Ackley in college and never had a season as good as Ackley's '09. Alvarez has more raw power, but Ackley is definetly much more polished with better contact skills, hand-eye coordination, and strike zone judgement.
A more comparable college hitter would be Gordon Beckham. Although Beckham hit 3-4 more HRs prorated in his '08 season, statistically they were VERY similar hitters in their walk years.