Canada already ended the Temporary status for Haitians and others after their natural disasters, yet the USA still allows them to stay. Thus it makes zero sense that they come to Canada other than they think they can get a better deal or avoid going home at all.  There is still a good chance Trump will allow the dreamers but probably will deport many other illegals whom are largely Mexican.
Mexicans have shown that they are not keen to run to Canada or they would have been swarming our borders long ago.  In general the Mexican populations in the northern states and Canada is very low as they prefer the climate in the southern US.  Seeing as few have family or friends in Canada they will mostly go back to Mexico where they have relatives and connections one would assume.  Haitians have many relatives and friends in Montreal and elsewhere in Canada.  Mexico is not in nearly such a bad state as Haiti.  Haitians have a far better argument that they still need refuge.