Winner: Hong Kong
One has to to live in Hong Kong for just a short while to realize how efficient the city is. Actually, for a resident with an ID card, they are reminded of that fact every time they leave or come back to Hong Kong; crossing the borders take at most 2 minutes.
I can't, for the life of me, understand how we still have such archaic border crossing system in Canada. Why would 99% of the people have to fill and sign the declaration form if 99% have nothing to declare. It makes no sense at all. Sure, Hong Kong is a free port but that doesn't change anything; the system is one of self-declaration either way so why the inefficiencies?
The Hong Kong system provides a faster, more scalable, more pleasant, less intrusive and, most likely, much cheaper system (all the customs agents have to be paid, and my guess would be that you need 10 times less agents in the HK system)