I agree with Imperial. I looked up the stats but was too lazy to put them all in. Anyway, Cameron can play more positions and can play much better defense than Damon, ranging from range to speed and to arm strength. While Damon has more OBP, Cameron is more powerful and they can both steal bases. Cameron also draws a fair amount of walks, and while Damon walks more, the fact that Cameron also draws walks is important because it seems to go unnoticed.
While Damon and Cameron seem to be similar players in terms of overall worth, I believe that Cameron matches up with the Red Sox needs more than Damon. First of all, Cameron can play defense which we need. With Damon, Hermida, Ellsbury and Drew we'd need to sit only one, so the defense would be Hermida, Ellsbury, Drew and they are all four lefties. With Cameron instead of Damon, we'd have a defense of Ellsbury, Cameron, Drew, which is a much better overall defense because Cameron > Damon AND because we can more efficiently use Ellsbury in left than Center. And, we have a right handed bat in the mix as well.
While we have some speed and OBP, I feel that we need a power bat more than we need an OBP machine. Granted, Cameron isn't a star power bat, but he adds pop to the lineup and as a righty should love to play pepper off the Monster. His HR numbers may stay similar but his doubles should increase. I think that Cameron gives us more opportunities to balance the lineup L/R and speed/power than Damon.
This is comparing value at the same price, obviously Damon would be more valuable at the lower projected price. I also like Cameron's ability to age better than Damon and I think he's more reliable.
I can't believe I made an entire post about Damon without mentioning that he left the Sox fanbase over money the first time. Well until now anyways.