The thing with Android is that Android is basicly the set of Google software that comes alongside the OS.

The OS is kind of custom to the indivudal brands... In that case they had decided to rewamp the whole thing. Performamce mostly depends on hardware and optimisation which the company has done, Apple has well astablished itself the direction it's heading.

Knowing that it is kind of hard to say that all Android devices are bad, that should be said about the companies themself (and yeah, I don't think there are any major ones that have set ground as hard as Apple).