A well taken point. Of course a big difference is the condo boom in downtown Toronto, which has not been duplicated at all in Montreal, or most other Canadian cities for that matter. Montreal has long had a reputation as a city of renters, and there are relatively few condos.
Unfortunately a similar comment would apply to office employment, and hence office towers. From Montreal's founding until about 1970, it was the predominant business centre of Canada, with one large head office after another. It's startling how quickly that changed; it took about 15 years (if that) for Toronto to become the unquestioned centre of Canadian business.