Both guns will be reliable. I've had an XD9 and XD45, never had a single issue out of either. As others have mentioned I don't care for the Glocks grip angle and they just feel like a brick in my hand. I also don't like the idea of the lone safety being on the trigger....doesn't make sense.
The XD has a few features that the glock doesn't and the goodies that come with the gun can't be beat for the money.
If the pain is lacking so is the discipline...
"the only 911 call I need is chambering a round" - Mr. Muller, MO car dealer