That's an entirely political decision that you or Parliament has to take—how many constituencies you want to have.
In our sample calculation we took half and half, because in Germany we have roughly half and half. But there are other countries that have 60% to 40%, and one has to look at the data, look at past elections, for what is feasible for Canada and what is best. But the decision on which is best is not ours; it's yours.