I think that comparison would need some support. It is exceedingly rare that I hear any normal person mention doing something on Android that they couldn’t do on iOS, and the number of enthusiasts isn’t enough to drive a market that large.

Can I easily put a compiler on either platform? My understanding is that you can't, which makes both platforms kind of bad.

You can easily put compilers on Android. Put the whole system on it if you want https://play.google.com/store/apps/details?id=tech.ula

Huh! I really was under the impression that you couldn't. It's been many years since I last checked though.

Thank you very much for correcting me!

It depends on the intended use case: compiling source code isn't the intended use case of neither of those platforms. It doesn't make them "bad".