The US spade-type plug and socket is said to offer a more conductive mating (I like that word) surface than a round (SA/Europe/Japan) plug and socket. UK plug pins are square and have a spring gripper either side. There are several makes of plugs similar to the one the OP is punting. Oxyiade make a few. Certainly it will offer a more intimate electrical contact than SANS 164-2 and with an earth pin it becomes polarised
But is Furutech better? The OP will tell you it is so and is not taken aback by the comments expressed on this post.
The Oxyiade (and probably this plug and socket as well) are not SABS approved, but are so robustly built that they will never give any trouble