This is a classic google search question but if I could offer any pointer, business schools differ in the type of candidates they attract, tuition fees and employers that recruit on campus coupled with the alunmi network. In a binary situation, business schools like Rotman, Ivey Western and Queen's are reputable in Canada and would compete for the same jobs available to other business schools. If you add the US ivy league schools in the mix, you get a much tougher and competitive environment. In the end, many of the business schools publish their employment performance at the end of the school year which shows breakdown of student that chose careers in different industries. I strongly recommend you check one out for HEC.