FYI, Android has 75% of marketshare worldwide and 55% in the US.
If you look at Android users as a whole, percentage wise of course they will pay less because they are a lot more popular in less well off countries. On the other hand Google's carrier billing support is a lot more extensive than Apple's, so actually being able to pay is less friction.
Amount of paying mobile users for both companies is clearly dominated by the iOS. About 1:5-1:10 ratio.
but it is sure that apple customers are more used to pay for applications. that's something that i noticed like 8 years when i switched from windows to osx/macbook. while on windows you could find free basic utility software like rippers converters and so on, on macbook they usually where paid applications.
Disclaimer: am contributor to react-native & iOS dev.