True, the number doesnt matter because most are crap...in both app stores. Android doesn however have many queality apps and many good ones that Apple doesnt have and of course vice versa so really it doesnt matter. The Apps shouldnt be a concern for choosing either.
I'd argue that iOS ecosystem has pretty much most of the apps that Android has, and more. Maybe a handful of apps that are on Android that are not on Apple's ecosystem. In terms of the popular top-tier apps, they're about parity to one another I'd say.
However....... there are thousands of Apps in the Apple iTunes store that never get downloaded. Like 400,00 of them
This can be said for many, many Android apps as well.