I have both. The pro finish is just their version of a phosphate finish, which can hold a bit of oil in it if you’re so inclined, and is reasonably tough. But it’s not unlike any other black aloe wrench I’ve seen, including the ability to withstand rust, or get rusty.
The gold finish is pretty resilient as far as I’ve seen. It seems more rust preventative than a phosphate finish which can rust through.