[aeturnum]

I have no anecdotal experience as to why people do or don't switch, but I think we should keep in mind that people often have difficult understanding and articulating why they like one product over another. Especially if they're unfamiliar with the formal language domain experts use.

To speculate, what could we get from "screen size?" Maybe they mean number of icons / elements on screen. Maybe they mean larger media viewing. Maybe they mean ease of physical manipulation. Maybe they mean a different DPI point. There are lots of factors that screen size affect, some of them would apply to any device with a larger screen, some of them apply to qualities that differ across mobile operating systems (iOS' handling of resolution, for instance).