Sure. I'll start with a bit of my experience.
When I started my Ph.D., back in 2001, I got a mortgage in Edmonton based on my salary as a graduate student. I don't think that's happening anymore. I'll say that to start.
The difference between Canada and the U.S. is that there are different opportunities for researchers to fund graduate students. For instance, in the United States, when I apply for a grant, I can put a graduate student on that grant and it would pay them a salary and would pay their tuition. I don't think those same opportunities exist in Canada, and that's a function of the difference in the granting system and the opportunity for individual researchers in the U.S. system to have many different grants to fund many different projects at the same time.
I don't want to say that everything is better in the U.S. with the money that graduate students are getting. In some universities, students are getting quite a lot, but there are still issues with students being at the poverty line.