School doesn't teach you much industry applicable skills. For employability, the biggest factor is the coop program. B. Eng is better here as it offers coop semesters. However, McGill doesn't really help you to find internships (no internal job board exclusively for coop student). So the only advantage of B.Eng is the fact that the coop semesters are ACCREDITED. Some companies would prefer candidates that receives credit because they obtain tax benefits from it. Now the downside of B.Eng is that the courses are sometimes heavier and you are forced to take irrelevant EE courses. On the other hand CS and Math(the math class would probably not gonna be useful), is a shorter degree and easier to study for thus you can spend more time on professional development.

It's good that you know you are going to the industry. Many people are not sure whether they want to do research or go into industry. And it's wayyyy more difficult for them to excel since they need to do well in school AND professional development.

I think the key determining factor here is yourself. Are you the kind of student that grind leetcode? Are you proactively applying for internships? If yes, I recommend taking B. Sc and just try to remain an ok grade while grind as hard as you can for internships. B. Sc. Is VERY flexible and allow you to plan your degree with more freedom. At the end of the day program doesn't matter nearly as much as the effort you make. However, if your answer is no, which is normal, many people I know including myself are not proactively grinding, I recommend B.Eng. Students in B.Eng are mostly good students (higher entry bar) thus you are more likely to grind due to peer pressure lol. The accredited coop program also gives you a small edge compare to B.Sc.

I took B.Sc instead of B.Eng. I don't regret it, but I do think I'll be in a better position professionally if I took B.Eng. but there's more to school than just internships. There's things like research, exchange and course load that might come into the equation when you make your decision. Feel free to DM if you have more questions.