CBSsports ranks Alcides 14,and JJ 17th amongst SSs..
I like Alcides,he'll most likely have better numbers then Hardy in everything,but HRs+RBIs.
So,if you want HRs+RBIs go with Hardy,,if not,definitely go with Alcides.
Alcides has a very high ceiling for success,which means he could exceed expectations more easily then Hardy (We KNOW what JJ will do.)..Alcides has 100 run,30 S.B.,and .300 b.a. potential,and is the current NL ROY favorite.
Bottom line: I would take Alcides' potential over JJs track record.