Re: HK USP 9MM OR SPRINGFIELD ARMS XD9801
If you are going to use it as a carry firearm, you better plan on more than three trips a month to the range for practice.
As far as making a choice for a carry sidearm, I would not choose either as they are both to large and heavy for me personally.
The XD is square and prints easily making concealment difficult and somewhat impossible for some people with slender body types. For those with heavier body types, it's square edges make it visible.
Lots of my shooting buddies carry the HK and love them.
"The Lord is a warrior, the Lord is his name." Exodus15:3