BSc Math and Computer Science at McGill

I received an offer from the Bachelors of Science program at McGill and the Desautels Faculty of Management. Both faculties offer a major in mathematics, however the business school tuition fees is more expensive than BSc.

Would I get the same career prospects if I do a BSc? What are the main differences between the modules? Overall, is a BSc Math and Computer Science from McGill a respected degree in Canada?