IEC 60906-1 (Type N). It was designed to be an international standard. It has no reverse polarity and is small but secure. It comes with all the important safety features and is also compatible with Europlugs.
However, the EU has sadly recommended against switching to this plug, citing plastic waste concerns from all our current plugs. However, Type N plugs have less than half the plastic of a Schuko plug. Someone should do the math and see if it would be worth it plastic waste wise to transition to Type N. Perhaps within 10 years, the savings that come with a smaller plug outweigh the plastic waste of older plugs.
I've gotten most of my friends to switch to it by showing them cool customization features