I have a friend who reviews firearms for some firearms publications. He has reviewed both the XD and M&P.
He prefers the XD's trigger. Both were good on the range. Both seemed capable of good durability.
The grip safety on the XD seems like a good idea too. We’ve been in contact with Springfield and they have been very good to us. Sent us a box of hats and other gimmes for the kids. Picture this. Cute UCSB coed (and if you’ve been there you know what I’m talking about;>) wearing her XD baseball cap to class. Heh.