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This is where the biggest debates will lie. Each rotation has both health and performance question marks. Likewise, each rotation has the ability to be dominant from top to bottom. For my purposes here, let's assume health for each group of five slated to start the season.
Chien Ming Wang
I give the edge here to the Yanks. CC is arguably the best pitcher in MLB not named Johan and is better and more consistent than both Beckett and Shields, and both Matsuzaka and Kazmir have had issues with walks and base-runners.
When comparing the bottom three starters of each rotation, Lester might be the best of the bunch, but has only done it one year and needs to prove he will not regress. The power arms of Chamberlain and Burnett give the Yankee rotation the ability to dominate from top to bottom.