What H4 horror stories? As for your dillemma, I would go to Canada. You said your hubby can get a postdoc position and you can enroll yourself in a PhD program. So go for that. Later, once you attain PhD, you can once again make a choice. With PhD, assuming it is in hard science, you can probably apply for US Green Card under EB1 or EB2 category, which is much faster than in EB3 category. Of course, if your hubby's job is highly lucrative and prestigious, then you have to evaluate that option as well.