HK USP 45 vrs Springfield Mil-Spec..........
Have U felt both? The HK will be much fatter.
If the HK fits your hand well, I'd pick that over the Milspec. But, be aware that if U are looking at new prices, U could compare a Springfield loaded to the USP 45, as the HK is more than the milspec.
The key word is if and Ship is right. The HK is to large for me and the Mil-Spec fits like a glove. There's $175 to $200 difference between them guns around here anyway. Good luck.
Any 1911 is miles apart from the design of the HK. not putting the 1911s down since I own three. But if it's a real defence handgun your planing on in a tough go. IMHO it's going to be the HK.