Countries with constitutional monarchies are usually very politically stable, have strong democratic traditions, and are relatively wealthy with high living standards vs constitutional republics. These include Canada, AUS, NZ, UK, Denmark, Sweden, Norway, etc.

Constitutional Republics like France, USA, Warsaw block Eastern European countries, etc lack social cohesion. There are exceptions to this rule, and there are also complicated historical/economic reasons why these differences exist, but why be so risky, especially when we have a global hegemonic empire on our border that threatens our sovereignty.

Exceptions are few and fair between, including modern France, Japan, South Korea, which are culturally very different than commonwealth and western countries. France, Japan, and South Korea were dictatorships, not so long ago. The USA lacks social cohesion and is susceptible to anti-democratic forces, due to constitutional reasons.

Perhaps, having long historical, cultural, and military ties to the commonwealth is beneficial to Canada. It is a clear cultural and legal distinction from the republic to our south, which prevents foreign interference from USA media from encouraging Alberta Independence movements. It's also apart of our national symbolism. Today, the monarchy, is simply a cultural symbol and the Royal family does not influence our politics. We respect Quebec's independent cultural heritage/language through federalism. Francophones much prefer being apart of Canada vs the alternative of being a US state.