The corporations in Canada have a number of choices, and there are a couple of distinctions.
One is that they can choose to incorporate provincially or federally, because the commercial power is split between the provinces and the national government. Moreover, there is then, in addition to the securities commissions, a separate power, securities law, which applies to those that are publicly traded and wish to participate in the stock exchange. Incorporation happens either provincially or federally, and then trading of shares happens separately under securities law, under the securities commissions.