I own a bunch of each - DA, Norinco, 870 Express, 870 Tactical and 870 Police.
I would rate the DA equal to the Express in finish, and slightly better overall because of the trigger group (metal vs. plastic - no issues with plastic, just personal preference). The 870P has both beat, but that's to be expected.
I've owned over 6 Norincos in the past and had ZERO issues with any of them. The SA Grizzly is made in one of the Norinco factories.