Which university should one select in Canada for graduate studies from the following two, University of Windsor or Dalhousie University?

Ranking wise Dalhousie University is good and the Job opportunity-wise University of Windsor is better, Halifax has more part-time job opportunities and fewer full-time jobs and the pay scale is lower and the tax is higher. As an international student, you might face difficulty with tuition and funding. At Halifax you will get plenty of parttime jobs. Since Halifax is also larger than Windsor, you will have more options.

Both universities have good placement with an 85.91% Employment rate of the University of Windsor and 84% Employment rate of Dalhousie University. 

The University of Windsor is known for many leading programs like Arts, Humanities, and Social Sciences, Education, Engineering, Graduate Studies, Human Kinetics, Law, Nursing, Business, and Science whereas Dalhousie University is known for its programs like Arts & Humanities, Clinical, pre-clinical & health, Engineering & Technology, Life sciences, Physical sciences, Social sciences, and Business & Economics.

QS Graduate Employability Rankings 2020 has ranked only Dalhousie University at #301-500. Selecting a university depends upon your priority. If you want to get a good education go for Dalhousie University but to get settled early in Canada go for Windsor University. Overall Dalhousie University is the potential choice as you can always move to Ontario if you don't find any job in Nova Scotia.