I have both an Android phone and an iPad. Google's autocorrect is far superior. The comparison isn't even close.

Handles a lot of these cases:

* Accidental last row instead of space - handled

* Easy undo - first backspace hit returns to explicitly typed out text then next one backspaces

* Whole word flashes on autocorrect

* Current candidate for autocorrect is centered on screen above keyboard

* Valid word won't autocorrect (can't actually test this since both devices are probably fully trained on what I type)