Ichiro also. Less chance of downside. I always worry that Pierre will forget how to get on first base. Pierre might get you 20-30 extra SB, but you get the probability of a much higher batting average, 8-12 more HR, a ton more RBI's and equal or better on runs.
Also, theres always the chance that Pierre plays worse, and Ichiro out-steals him, too. No chance that Ichiro would play worse and Pierre would out HR/RBI him. (probably BA too)
If I were playing third base and my mother were rounding third with the run that was going to beat us, I'd trip her. Oh, I'd pick her up and brush her off and say, 'Sorry, Mom,' but nobody beats me.
Leo Durocher, Brooklyn Dodgers Manager