AnySoftKeyboard on the surface seems cool, however, they've overloaded it with unnecessary characters. When I tried it, I had English selected and yet somehow it has characters that are _never_ used in English. That's not necessarily an issue, but when non-English characters are easier to type than English characters, it decreases my typing speed significantly. I raised an issue about it and was quickly dismissed. I've stuck to SwiftKey since. I'll have to try OpenBoard!