It is fascinating when you arrive to the same result by following different paths. I was just checking the staatfinder, basically to find the most commonly used viewports worldwide; my attention was drawn to the individual country staats and the fact that northern America and northern Europe had a higher usage of a 4.7 size viewport while Egypt, Argentina, India to name a few were using more a 5.5 size viewport. Guess what the 4.7 is an i-phone while the 5.5 is (any android).
I assume the results reflect a different cultural approach and a divide on spend ( bigger screen size, android /apple).