XD all the way. I spent over six months going to every gun store in my area to look at as meny diferent XD45s and Glocks as I could find. After only a few handelings I strongly prefered the XDs feel over the Glock. The Glock is a excellent firearm in its own rite, but I liked the XDs added extra safety feature of the back strap safety the Glock lacked.
I would have to beg to differ on the discription of the Glocks trigger being superior to the XDs, on the contrary it is the opinion of those far more qualified than myself who rate the XDs trigger as one of the best of its type out there and comes closest to matching the single action feel of the 1911, and is quite well suited to for performing so called "double taps", at least as well as the Glock.
Now that Springfield is going to offer the XD with a manual safety, it makes it all that more atractive and more preferable VS the Glock to the majoraty of shooters, IMHO. My money is on Glock comming out with a Manual safety version of certain models in the near to very near future to compeat with the XD.
As you have been advised, try both in your hands and see what feels best to you.