This is what currently passes for bling for an XD/XDm:

It's an aluminum striker spring guide, replaces the little black plastic one on the back of the slide.
I'd say the difference in bling makes the XD/XDm a serious business pistol and the Glocks toys.
Gets his lawn chair, some beer, pretzels, fires up the barbie and sits back to watch the fireworks and some forum members melt like polymer guns tossed in the campfire
Yeah yeah yeah.
Get the stainless steel guide rod for the Glock, real guns skip the aluminum stuff.

You can also get a Titanium striker for the Glock Real Guns. Plus other titanium parts.
The titanium striker reduces lock time by a few fractions of a second. I doubted it's usefulness until I did some searches on it and found a guy who had the equipment to sense and measure the movement of the striker within a gun as it was fired.
Don't remember the exact amount of time it cut out, but I do remember his calculation that at SD ranges of 21 feet or under, your bullet will be hitting it's target before the other fellow's left the muzzle, if the sear is released at the same time.
Don't know if that woud make a difference, but it sure seems like it has a good chance to be an advantage