Jacques Herzog and Rem Koolhaas see themselves as the twin giants of the architectural industry, says Deyan Sudjic, and like any other rival titans, they cannot seem to resist the temptation to one-up each other. “Between them, they have transformed architectural debate… [but] the relationship between them is becoming more like that between Godzilla and King Kong. They can’t help but go swarming all over the skyline, trying to take pokes at each other. And in the end, they are interested in entirely different things.” Herzog’s magnificent new Prada store in Tokyo is the latest salvo in the friendly battle: it “comes hard on the heels of Koolhaas’s much- publicised New York flagship for Prada, and effortlessly eclipses it.”