it's my opinion that build quality comes in different forms, but with this orion example, it seems to be somewhat balanced in all the facets you mention with a slight lean towards being overbuilt as different engineers in electronic architecture find different means and techniques to achieving the same general end result, however, capacitor quality arguments have been beaten to death across the net for many years on end that some swear by, and others believe are all proficient at getting the job done as long as theyre not film/paper types.
your 1400.1 is built rather well and real world testing indicates it produces in excess of 1800w @.8 ohm at 14.4v, but comparing the two is trivial just by looking at the components used as we dont really know how an arbitrary design following a topology uses said arrangement of components together as a whole. we also have to understand that some engineers design based on what is available and cost effective at the time.
is the 1400.1 impedance stability capable of .5? idk, honest question.