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Oh nvm, my VPN is set to Japan. I'm really in New Zealand.
I will explain my ranking. The drawbacks that relegated each was:
UK -- Size. Otherwise it is pretty great. Australia also beat it because the slanted prongs makes lightweight chargers (mobile phones etc) less prone to lagging. They also lack the high amp alternatives.
EU -- Easy to wear down. Many get so loose that you need to replace them. There is also a size difference, as Scandinavia actually uses a slightly wider one if I recall, but it's still mutually compatible with the rest of Europe, and the Swiss one is likewise compatible just a bit smaller. This lack of a standard is pretty toxic. It also lacks a high-amp variant.
US -- This plug is overall very bad. It's so bad that Japan is planning and preparing to spend trillions of yen to overhaul their entire electric grid and households to get off of it. But to highlight, it takes a lot more copper to carry the same amount of energy. The wattage is so low. There is only one high-amp alternative (the nema 5-20) but even this alternative is so low, that it offers still less electricity than an ordinary outlet anywhere else in the world. Given that this line uses 120v in the USA and 100v in Japan, the runs have to be made very short, because voltage drops much faster on small distances. You will have a meaningful voltage drop if your house is even somewhat large on the most distant outlets. Your extension cords have to be made shorter with lower calibre, etc. The prongs are parallel, making it the most prone to getting loose and sagging. It is the least safe. The list of unresolved issues just goes on...
I hope I helped one of you guys.
If we ever adopt an international standard, please remember the Australian plug. It makes life so much easier.
