I applied to Mathematics/Physics at all three. Now, say I get admitted into all three, which one should I chose? My current plan is to later attend grad school in the US (hopefully at a school with a big name), and I was wondering which of these universities will help me the most to get that done. I hear Waterloo is the best of its kind in Canada, but Toronto and Mcgill have a better reputation among admission offices. What do you suggest?