Take gvd0006's word, his has/had most of the guns that most of us drool over.
HK45c(w/LEM) is a softer shooter than the Glock 30 gen4 and 30s. As a owner of all 3 I find that the HK45c has a better trigger, is more accurate, and the ergonomics fit my hands better. You honestly just need to at least hold both to see what feels better in your hand.
If you don't mind a slightly larger gun check out the FNx45 or the FNs line and the PX4 Storm. Between my HK, FN's and my one PX4 storm I don't ever touch any of my 7 Glocks anymore. They are all dust collectors now.
But to me choosing a Glock over a HK would be like me choosing a Honda over my Benz(which I would never do).