In terms of Canadian security interests, we should prefer NORAD without silos, and for one specific reason, which is that NORAD is the only perspective that exists where people like General Jacoby, and American officers as well as Canadian, think “North America” rather than thinking “United States” or “Canada”.
Given the threat environment, the complicated nature of it, and the integrated nature of all the different types of threats, you need North American thinking, not national thinking.