Well, the iPhones were in fact faster. Faster at playing the animations, at least.

I worked on an app in the iPhone 4S and Galaxy S II era and we wanted to use the same trick on both: smoothly animate the view switch between user interaction event and the API response. It worked super smooth on iPhone, and it was jittery as hell on Android. In the end we left the animation on the former, and move the users straight into the loading screen on the latter.