Now that he's back with Phoenix, I expect Z to get back into his good form. If he was still on Pittsburgh I'd say Orpik for sure. I think each of these guys will find new responsibilities this/next season, as Z will be back playing 'his' system, and Orpik may get a reduced role so I'll have to see how each handle this.
Very curious to see how they play out. If I had to pick one at this point, it would be Michalek, just because he's got to prove something. Orpik has the potential, but he's gonna have to up his game a notch to look better IMO.
Phoenix stole Michalek from Pittsburgh, I will take Michalek because he is back in Phoenix.
Michalek is a good player but he needs to be somewhat insulated. He was excellent when Pittsburgh played a conservative game (when Sid and Malkin went down for the year), but when they opened it up last year he was exposed. He's a good fit for Phoenix and Orpik is a good fit for Pittsburgh. I'd rather have Orpik.