There are about 200 million people in the world who, if Tim Cook stood up and announced that the next iPhone was going to be a turd on a stick, they'd still rush out and queue and buy it. And therefore, I trust Android buyers to be actually rational actors, and therefore the popularity of any Android phone is a reliable signal of its quality, because they've bought it despite the fashion. Whereas in Apple, I would argue that the herd mentality and the complete cultish nature of the thing means I can't quite trust social proof.