The tooling for Swift is certainly miles better on iOS, but I do like Rust as a language. On Android the most comprehensive solution I've seen is Xamarin, but last time I tried it (which was years ago), I wasn't a fan of the GUI and the perf was worse than Dalvik. Hopefully that has improved now.
However Rust is already picking up steam in Firefox modules, hobby OS development, university CS degrees and GNOME modules, so there might be a path there.