I purchased my Anderson PP connectors from Quicksilver Radio, West Mountain, R & L, and HRO. I’ve noticed no difference in quality except for the 45 amp connectors. Sometimes they don’t roll so nice in my crimper and are very difficult to “click” in to the housing. I believe that’s mostly due to my technique, and not manufacturer quality. No science here I may have received branded all along from my sources.
I’ve used Anderson PP’s for a long time, mostly in RC Aircraft (soldered connectors in a flying machine are a bad idea) with great success. I’ve been through a lot of connectors. If some Chinese knockoff versions were slipped in I never noticed. They rarely failed.