Queen's is not bad, specially her EMBA, which has very high ranking globally. But, in the past few years, she did not have any significant improvement in other programs. So, effectively, Queen's is drew down by other universities in Canada. If you have a chance to visit her website, you will find Queen's professors of Business School are just so so. If you focus on the Canadian market, Queen's would be still a choice. For better Ph.D. program, you should choose UT or UBC.
Thanks for wales_hu's advise, however, as I know the admission of PhD program for UT and USC is very competitive, even for the americans. so for chinese , I think the chance is almost zero.