Had both before and preferred the style and overall finish of the HW45. Not a fan of the big plastic grip on the scorpion and don’t think Iv seen alternatives for it but maybe I’m wrong. The standard HW45 fits colt auto grips so loads of options there and never had a problem getting it on aim. I think a loose hold was best and lots of people say to strip out the excess grease as otherwise this can cause inconsistent shooting.
I once had a version I think was called the custom combat, it had 3 barrels, a finger groove grip and a threaded muzzle. Sadly and as happens too often sold it never to see another.