The HK45c was always my favorite non-1911 .45.
Glock 19 size, 8 rounds, thinner slide than a USPc, better DA/SA trigger than a P2k/P30, shorter trigger reset than the P2k/P30, ability to carry cocked & locked, larger mag release than USPc, ability to take extended HK45 full size mags, 9 trigger variants compared to the 3 variants for the P2k/P30, etc.
I always wished H&K would make the same gun in 9mm rather than going down the P2k/P30 line on the 9mm side. The improvements were significant enough over the USPc series that it was just a better overall pistol.