There must be some criterias in the process deciding. My main criteria is the reputation of the university. For instance, if I got an admission offer from UBC, I would choose it because it is one of the top 50 universities in the World. But, if I get an admission offer from UCLA, I would choose UCLA because it is even better than UBC.
On the other hand, my second criteria would be the city. If it is a very cold place I would never choose it since social life is also very important. I would never go to Montreal, Toronto or Boston (Even Harvard) but I do not hasitate to go Vancouver, Los Angeles, San Fransisco or San Diego. I mean the place where you live is very important. The best place in Canada, for instance, is Vancouver since it is much warmer than other cities in the country and it has a wonderful environment.
I hope this can help you.