Another cool thing about the Swiss system is the derived 3 phase T15/T25 plugs:

https://www.plugsocketmuseum.nl/Swiss_3hd.html

Our washing machine uses a T15 plug but the socket can also accept a T12 single phase plug instead.

(As a Brit, I'd also pick the Swiss plug as the best, except that the fuseless design wouldn't be good in the UK because of the 30A ring system described in another comment.)