Actually the argument is a part that is legal on a production legal gun would be allowable on another production legal gun.
USPSA has pretty much open the doors on production alllowing for aftermarket hammers, etc to be legal.
Both are good. with trigger work, both will feel great.
models without firing pin block. SP01 Shadow, Shadow 2 will have ability for shorter reset/less pretravel in SA.
Too much gap with shock bottle and afc mags. Hard insertion to get the slide to fall off slide lock is recipe to jam the mag past the mag release.
Auto forward (or whatever they call that) is not a feature.
get a magazine / basepad combination that stops mag on bottom of frame.