‘X’ marks the spot on a map where the treasure is found. But when it comes to the iPhone X, there are a few different types of treasure: the original iPhone X, the iPhone XS, the iPhone XS Max and the iPhone XR are all top-quality iPhones that you can score a fantastic deal on by buying refurbished, but which one is best for you? Is it worth switching from an entirely different type of iPhone or even from Android?