In my field, human (social and political ) geography, UBC may be in top 10 all over the world.
But as a geographer, I think the place that is close to capital and big cities like NY is more helpful to IR student, since location works.
I would like to share a story. My supervisor in China's best university is a man who cannot even READ English paper. I wrote one with a corresponding author who was in GIT and we published the paper in one of the best journals in my field. I finished the writing and the co-author in GIT helped me to polish it. But finally my supervisor in China took the first author.
I applied another PHD program in the US and CA and now I am waiting. Luckily, my co-author as referee explained my work and authorship in his letter. Hope I would be accepted and leave China for a just normal place.