You're picking between a Native language (even though parts of it are compiled to Obj-C) vs a JavaScript library that converts JS into Obj-C or swift code. I don't think its a matter of "go-to" but a matter of what's needed in the project.
Need Less Cost, More Flexibility, Single codebase for cross-platform? React Native.
If you need native performance or you're developing the application purely for iOS and not android/windows/web etc. Go for Swift UIKit or SwiftUI.
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You're picking between a Native language (even though parts of it are compiled to Obj-C) vs a JavaScript library that converts JS into Obj-C or swift code. I don't think its a matter of "go-to" but a matter of what's needed in the project.
Need Less Cost, More Flexibility, Single codebase for cross-platform? React Native.
If you need native performance or you're developing the application purely for iOS and not android/windows/web etc. Go for Swift UIKit or SwiftUI.