My perspective is going to be a little bit unique here, in that all of the fields/companies you've mentioned (IB, consulting, and Big 4) are highly, highly over-rated. There's very slow growth, low salaries, very few opportunities to even get hired, and generally bad environments to work in. Consider a career in tech (SaaS, security etc.), whether it be finance, in-house consulting, marketing, sales, operations, and so on. If I were you, I would use the biz dev experience to find similar roles in SaaS, which would pay me FAR more than anything I could make in finance or consulting.
Having said that, I wouldn't read too much into which of the two institutions is more "prestigious". While your overall experience might be 'better' (I mean it) at Queen's/Smith, it's also the more expensive of the two (quite significantly), is far away from Toronto (where all the jobs are), and has little-to-no bearing on your job prospects vis-a-vis an MBA from York/Schulich. All else being equal, a candidate isn't more or less attractive to a potential employer if he/she graduated from either Queen's or Schulich. So the decision criteria could be as follows:
(1)
Cost - how much of a factor is it for you? Can you afford a more expensive MBA?
(2)
Quality of the year-long experience as an MBA student - how important is it for you? If quality of your overall experience as a student is something you're willing to forgo, in an effort to cut costs, it's an easy pick....
(3)
Proximity to Toronto - you're constantly going to be travelling to Toronto for coffee chats with potential employers. Do you want that trip to be a 20-minute train ride OR a 3 hour train ride? I suppose a lot can happen over virtual chats, so this might not be a super-important point, but worth considering regardless.
(4)
Strength and quality of alum - Both are more or less equal. Neither one has a strong advantage over the other on this front.
(5)
Impact on your job hunt - Again, all else being equal, neither school has a strong advantage over the other. If you do the right amount of networking, interview prep, and related activities....you're going to be successful at either instituation.
I know this answer gives you more data to ponder on (as opposed to giving you a final answer), but that's the point, you have got to pick what works for YOU. Feel free to ask any further questions.
Myself: Queen's/Smith full-time MBA '17