I think SwiftKey is a better keyboard in terms of regular, long-term use. It's more accurate than FUTO, and doesn't lead to near as many errors. But FUTO has that text-replacement feature and SwiftKey does not. So, I think I'll stick with SwiftKey as my daily driver, and use FUTO when I need to use text-replacement. Switching keyboards is very quick and easy, so it will be an easy process.