Asklemmy

If you don't feel pain when stepping on Legos for whatever reason, the UK plug is easily the best one.

I'm always up for a bit of controversy. I like the basic ungrounded American plug (NEMA 1-15).

It has no safety features. Just about every American has shocked themselves with it once, but very few have done it twice. I like it because it's compact, and that leads to some conveniences:

• It works great in folding designs for portable power supplies. I've seen folding implementations of Europlug and even British plugs, but they're not as compact.
• It works great for ultra-compact splitters and many-outlet power strips. Yes, you can be dumb and overload these, but we have a whole lot of low-power electronics in the modern world such that it's not hard to have a dozen devices each pulling less than an Amp. Multi-port USB power supplies are starting to mitigate this a bit.
• It doesn't have shutters (by default), so it's easy to plug things in. Every plug type I've encountered with shutters takes a lot of force and sometimes binds.

Hey did you get that idea from the coffee shop thread? Someone was asking about weird outlets shown in a picture.

My answer for the question is obviously the UK standard.

The smallest is the best. I don't know which one is the smallest, but I want that one.

UK are safest, EU are both practical and almost as safe (as it supports a variety of plugs, both with and without grounding), and US is complete and utter garbage built for garbage voltage. Plus, the US one looks scared.