Which is more important for weak pitchers in hitters park??

If one had to choose between a power hitting C-3 versus a power hitting 2b-3 , which would be the more intelligent choice to most help the pitching staff?
http://forum-365.strat-o-matic.com/archivesn/
http://forum-365.strat-o-matic.com/archivesn/viewtopic.php?f=12&t=104264