I don't know by the time I am writing this what has happened, but generally there are lots of factors you should consider before making a decision.
Which of the professors you are more interested in working with? Is funding important for you (I am 90% sure it is because you are an international student)? Do you have any financial support rather beside university (family, friends, ...)? You should also notice the weather of the city in which the university is located. I've heared that Edmonton is colder than Alberta. I think the overall ranking between these 2 universities is not very different but UofAlberta has better ranking in CS, right?