Last year, the big change to the then-new iPhone 5S was the addition of a gold option. This year, Apple upped the ante by offering not one but two screen sizes — both of them larger than the 4-in. screen on last year’s flagship iPhone.

Apple calls these Retina HD displays, but what they really are is a conundrum for iPhone users not accustomed to choosing a display size. Since the new iPhones (and the Apple Watch) were unveiled on Tuesday, I’ve been asked repeatedly about the new screens from would-be buyers. As it happens, I’m mulling the same question, since pre-orders begin tomorrow for the new phones, which go on sale Sept. 19.

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