Re/code offers some interesting current data on the popularity of the apps provided by major companies. The title – You may own Apple’s phone, but you’re using Google’s apps – is a good summary. The Re/code article draws on more detailed data provided by Quartz.
Of course, nearly all Apple phone apps come through the Apple store, but this seems fine as the two major providers of the more popular apps (Google and Facebook) generate their revenue in a different way. Diversity is a good thing.