I have an admit from HEC Montréal and Schulich (India Campus). I'm waiting to hear back from Sauder and Desautels and would love to explore a career in management consulting post my MBA. Which one of these programs would be best?

Do you want to work in Canada after the MBA? If so, a Canada-based program would be better over Schulich's India campus.

Of the schools you applied to, McGill is probably the best, but an argument can be made for UBC, especially if you wanted to work on the west coast / in Vancouver. Do you speak French?

Of course Ivey, Queens, U of T are better brand names. Given your list I'll say Schulich is the strongest contender and will open more doors in Toronto even with first 8 months spent in India.
If you get admit from McGill, then Mcgill would be my #1 pick.

Yes, McGill is portably the best option. HEC would actually be a great choice if you already spoke French and were looking to work in Quebec. McGIll would offer more options for those who don't speak French.