Mcgill actually is more famous than U of T. If your goal is in US, you should go for Mcgill. Americans are very arrogant, anything that is not in US is non-existent to them. Mcgil is famous because in the past it has produced some scientific milestones (eq. the discovery of insulin). And Mcgil's computer science was famous too because they had written quite a few public domain software sets for UNIX in 80s. We have a couple of Mcgil graduates in the company,academica wise I believe they are as strong as those graduates from top US schools. Mcgil would have been my target if I had to go to a school in Canada. All the comments are based on the undergrad education, I don't know much about canadian graduate education, which depends very much on how much money a school has.