Norway to Quebec vs. New York

My grandfather emigrated from Bergen to southwestern Minnesota in 1885. I am trying to determine if he came via Quebec or New York. I am leaning toward Quebec, because it seems like many of the Norwegians heading to the upper Midwest came that way. Why? Was it shorter or less costly? I understand they didn't have to go through immigration if they came via Canada (at least not until the 1890s). Maybe that was a consideration. Does anyone have any further thoughts on why an immigrant would choose to go through Quebec?