According to the Chart published by ‘Statista’ and data source (App Annie) iOS device users prefer paid apps more than Android device users.

Below chart is showing comparison about free and paid apps downloaded by iPhone, iPad and Android device users.

Well this chart also give a hint that it is not easy for android apps developer to earn from paid apps as people prefer free apps over paid apps.; whereas iOS apps developer will feel more motivated as iOS device user are interested in paid apps as well equally.

paid mobile apps vs free mobile apps, android apps vs iOS apps, android user use free apps, iOS user like paid apps
Source