Yankees- Hideki Matsui- I`m assuming that Giambi will be at first base which is what it looks like at this point. Matsui came back well last year after missing a few months due to a wrist injury in 2006. He fell off a little bit from past years but that`s to be expected since he was still not completely recovered until a few months into the season. Matsui's a pretty inconsistent player but by the end of the year he usually comes pretty close to his career numbers. Even in a slight down year he still managed to get a .286 EQA (.290 career average). His defense was never great and he had definitely become a liability by last year. The move to DH should help him, he`s said he enjoys DH'ing and should be all right.
Red Sox- David Ortiz- While I think a lot of the credit Ortiz gets for being a clutch hitter is exxagerated and largely because of randomness he is without a doubt a very good player. He`s a hitting machine and shows no signs of slowing down even slightly. Last he had what is probably his best year yet. He had the best EQA of his career, .337, and the best BA and OBP as well. His SLG% was the second best of his career. Without him their no way that Boston could have won the World Series in 2004 or 2007. His baserunning is worthless but all in all he`s one of the best pure hitters in baseball.
Conclusion- Red Sox- Matsui is a good player but this one isn`t even close. Even without the clutch argument Ortiz is one of the best players in baseball and he doesn't even play the field.