I agree with Ganjavih--Montreal has some wonderful old buildings, but TO is certainly no slouch. And I love the gardens--they're a distinctive feature of our city for sure. Believe it or not, even in the nicest bits of London (say, Richmond or Hampstead)--every house has a front yard but that usually means a parking pad and some recycling bins. The overflowing vegetation in front of Toronto houses is incredible by comparison--and something I've heard Montreal visitors comment on too.
Additionally, the truly spectacular old greystones are present in a pretty small area of Montreal (the true centre of the Plateau around Sq St-Louis, where most of these photos appear to have been taken, bits of lower Westmount and the Quartier Latin, etc). What prevails elsewhere is more utilitarian, with some exceptions.
You could assemble a similar collection of images of Toronto's very best bay-and-gables etc.--which do represent a very different style, but to me are just as impressive. But who cares? Both styles--and cities--are tremendous places with unique built form. Canada is so lucky to have both.
If there's any difference between the two cities' historic endowments, I think Montreal takes much more pride in its historic commercial strips. In this funny Protestant way Torontonians are fiercely proud of their own homes, but that pride falls down in the shared spaces. The result is the mishmash of hydro wires and broken sidewalks with which we're so familiar.
Part of this, of course, is that very little new is being built in Montreal, so the city sees its structures as essentially permanent. In TO where everything seems about to be knocked down for some high-rise I guess the same incentives aren't there...