iPhone people are a notch up the socio-economic scale: higher income, higher education, higher representation in professional and managerial jobs. They are tech enthusiasts, but more as consumers than producers: a big over-weight for digital device addiction, but none for technical jobs.
Why does Apple retain the lead in app quality? The homogeneity of the iOS platform is one big reason: it’s much harder to develop for Android due to its many software and hardware variants. This data sheds light on another big reason. iPhone is where the money is, and iPhone people are the most enthusiastic tech adopters. These two factors indicate that Apple’s app lead will persist: the problem with Android fragmentation is not going away fast [if at all], and Apple has a strong franchise with the most valuable customers.