One of my favorite features in Windows Phone is its truly excellent keyboard. It’s far more accurate and easy to use than the default iOS keyboard and many Android alternatives, but you’ve had to use Windows Phone to take advantage of it so far. Microsoft is planning to make its Word Flow keyboard available on other platforms, starting with iOS.
The problem with iOS third-party keyboards is that they mostly suck due to the system’s restrictions. And they’re usually even worse for foreign languages.