It's a good question. I'm not sure that I would have a quantified answer. I don't think I have an answer that will be rigorous, so this will just be off the top of my head.
France obviously would be one country that would attract francophone immigration, especially from the continent of Africa, and Belgium too, I would suggest. For Switzerland, I'm not sure, because Switzerland has very specific immigration policies that are quite difficult. I would suggest that France would be a direct competitor for Africans.