Dave,
I’m going to politely disagree with you a bit. I have owned only one example of each, but also tracked reviews and commentary by others.
Bottom line up front: I think they are equal. But very different.
Power: Scorp is in good condition always a 5+ gun. 45 is often mid-4s in factory trim.
Accuracy: tie. I can make a case that the Scorp is easier to achieve results with, because of its conventional layout and therefore normal spring-surge characteristics, rather than the overgrown Johnstone-Fearn Webley arrangement of the HW.
Build quality: not sure. Probably HW.
Ease of servicing: HW. By miles.
Handling: tie. The Scorp is colossal and the HW is smaller, and the HW has a 1911-style grip, so ought to win, but the Scorp is not bad either.
Trigger: my Scorp has a nice one. So does my 45. Tie. Advantage overall to the 45?
Cocking effort: 45 wins.
Coolness: well, I am of the age when the Scorpion was new and dead cool and the 45 did not then exist.
As I’ve said on here before, I spent many years thinking the Scorpion was a truly silly thing. Only once I got one did I change my mind. It’s surprinsgly good. (And the 45, while good, is not as great as some suggest).
Just my opinion.