I live in Greece (that's EU )

Well it's not that much of a deal, u just have to use the tension wrench on the opposite direction to open the lock, but i was wandering as i havent tried the US lock type (with the pins up), should locks with the pins downwards be any different or more difficult than the other ones?
I mean what's the point in constructing locks with pins up or down, and not just make locks with pins up?