Here's my projections for each of them:
Zam....: 15-9, 3.09 ERA, 1.22 WHIP, 197 K's
Hudson: 16-9, 3.11 ERA, 1.20 WHIP, 152 K's
So yeah, they're very close to each other in everything but K's. Hudson is more of a sure thing though, and Zam might start allowing HR's which Wrigley is notorious for. Other than that I see no reason that Zam shoudln't be taken before Hudson.
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