Only massive difference I can think of is that in Canada you have to file a flight plan for any trip further than 20nm from your home base, but that is so much easier in North America than here... Other than that, very similar to flying in the US.
I personally tried out Dorval Aviation, located on Montreal International airport. They have a couple of C172 and the rental price includes airport fees. Interesting experience to get ATC telling you 'please expedite runway exit, BA flight from London is on short final'. They also provide float plane lessons.
Also went to Cargair and Air Richelieu, at St Hubert. Both good schools: Cargair is very organized and professional. Air Richelieu has some fancy Cirruses.
I would also recommend to take advantage of your presence there to do a trip to the Niagara Falls via Toronto: unforgettable trip! Nearby you also have Quebec, Ottawa and Mont Tremblant, all worthwile destinations.
Enjoy!