Android Oreo is more optimised and smoother than iOS 11 at this point.This Video was just published yesterday. Look at the Pixel 2 demolishing the A11 Bionic in bootup test and opening apps all of us use everyday
The video is a showcase of how badly optimised iOS 11 is on Apple’s “disconnected older products”.
Google has surprised me with Oreo. Android is rapidly leaving iOS in the dust with optimisation as Google seems to have a laser focus on performance compared to Apple with faster animations and an overall snappy feel.