I use Xcode for:
- Creating new projects (filed an AppCode bug, they’re working on it)
- Editing projects (it’s just easier)
- Storyboards
- SwiftUI
Other than that, AppCode is the hands-down winner if you do any:
- unit testing
- test-driven development
- refactoring
Since I’m all about those things, it’s AppCode for me as much as possible.