Value different; also see Apple’s Road to a Trillion Dollar Company (Tech.pinions)
"There’s another mystery twist, here: How did Apple get to $1T with such a poor price-to-earnings ratio (P/E)? As you no doubt already know, P/E is the result of dividing the share price by the earnings per share (EPS). The higher the ratio, the more willing investors are to pay a higher price for today’s shares, assured by the promise of substantially higher earnings (EPS) in the future.Apple at $1Trillion: The Missing Theory -- Monday Note
This is where we get into some intriguing comparisons. Microsoft’s P/E is a solid 48 and Alphabet’s hovers around 50…but Apple’s is a meager 17. Caricaturing just a bit: “Apple still trades like a steel mill going out of business.” In more sober words, investor actions say Microsoft’s or Alphabet’s future earnings per share are safer than Apple’s, hence the premium they’re willing to pay. With a P/E of 50, Apple’s Market Cap would approach $3T…"