While this is not true of everything, I would take good condition OE UCA’s over any of those imported reproductions. You know the re-popped stuff isn’t the same thickness. Of course, I wouldn’t install NOS bushings or ball joints in them.
For sure, 100 times out of 100 I would prefer to go with the OE option. Problem is I couldn't get any 73+ upper arms local to me, so I hit the easy button and ordered them from Summit. Delivered to a friend's mom's place in the US so I didn't pay duties, taxes, or international shipping. He visited his mom and brought them back for me.
You raise a good question about the weight. I have a set of OE 72 arms (which were supposed to be 73+ arms) so I can weigh them both and see how close the new repop is.