@CollegeFreak9488 Americans do not have a greater chance of getting in than Canadians. Canadian admissions is more predictable, so you may have a better chance of getting into higher ranked Canadian universities than the highest ranked American ones. It mainly depends on your statistics.
The number of AP and honors classes doesn’t matter, afaik. Canadian schools don’t do weighted GPA. For the top universities, it is expected that a student will have taken the most rigorous classes. eg You should take calculus and not applied math.
McGill is very transparent with their grade and ACT cutoffs for admissions. If you look around their website, you should be able to find the page.
For all these universities, the cutoffs will depend on what program you are applying for. If you post which program you are applying for, with or without your GPA and standardized test scores, I or another poster can give you a better idea of your chances.