I tested different 3rd party keyboards. First of all:
3rd party keyboards often feel like foreign substance. They crash very often. And there is no support for voice dictation.
Apple Keyboard:
predictive suggestions are very good, but there is no flow input and the design of the keyboard looks very outdated.
- SwiftKey:
has very accurate flow input, but there are only 2 designs. SwiftKey crashes very often.
- Minuum:
many beautiful designs. But predictive suggestions are very bad compared to the Apple Keyboard.
- Fleksy:
innovative gestures. Predictive suggestions are actual unusable.
- Swype:
Flow input less accurate than SwiftKey. But more designs then SwiftKey. Different Languages are separately and not one layout as in SwiftKey.
Conclusion of 3rd party Keyboards:
There is still some work to do. 3rd party keyboards need access to voice dictation and crashes should be minimized.