In my opinion, the choice of whether to hire Swift developers or Flutter depends on the type of app you want to develop. Base your preference on the kind of comfort level you want during the app development process. Just to recap this comparison, Swift vs. Flutter, this is what we have come to know:
Use Swift if you want a perfect native iOS app with great functionalities. On the other hand, Flutter empowers you to develop both iOS and Android apps with a single codebase.