I may be skewed by the fact its the plug of my country; but i like the type L plug (its the no 1 in the photo) mostly because its modular: you dont need to get a specific faceplate to have a certain arrangement of plugs, switches etc... You just take the brace plate off and you can rearrange the fruits in the box to your hearts content. Eg: you pass an ethernet cable and need to put a keystone in the wall; you just buy the fruit and put it in the place of a blanking plate. What i dont like is the almost total lack of shielding for the live and neutral.
There's a lot of dangerous stuff coming from questionable countries that are referencing neutral in bad circuit designs. That can make chassis/buttons/exposed parts live if the polarity is set as such. Even worse, it might work great for a long time and then a diode or capacitor goes open circuit and suddenly something is live that wasn't before.
In a device I trust, sure polarity won't matter. But, there's a lot of bad stuff out there, and I really don't want to count on my RCD to stop the current before it's done enough damage to me.