Neither Scott Drake nor Dynacorn are manufacturers. There is only ONE set of tooling and manufacturer doing the 71-73 outer door handles. This is one of those cases where only one manufacturer has tooled-up, and everyone imports the same product through different consolidators/suppliers in Taiwan.
That goes for a lot of the 71-73 stuff, because due to the lower production numbers and cars still existing today, there's typically not enough market-demand and volume to support two-or-more competing toolings and manufacturers. For instance, all fenders, hoods and doors come from the same manufacturer for 71-73.
As for these handles, they are a nice looking and sturdy reproduction, but the only criticism (earned) that I've seen is that they do not lay as "flush" as originals do while at rest.