In my opinion it's Type-F
Because:
* It's bi-directional
* It's grounded and ungrounded plugs use the same socket
* It's already widespread
* Your fingers can't touch the live wire as you're plugging in a wire
* Low footprint
Hear me out, type L, the one in the middle, is the best socket, as it has all the things you talked about, but also accepts Italian plugs.
Type L bipasso (the one on the side) instead is the most space efficient, while retaining type C compatibility and grounding. Type L plugs also have plastic bits at the end to avoid contact with live wire (like UK one).
Ek-Hou-Van-Braai
Rinox