you should look up citynerd on youtube, he does lots of top ten lists of primarily NA cities ranking them on various aspects of urbanism, transit, biking and affordability. the one I linked here talks about montreal, dubbed the most European city in north america, and talks about many of the topics mentioned above.
but also and probably more importantly, theres so much of your personal preference to take into account — what kind of climate do you want to live in? large school or small university? will you need to work or find housing to afford it? ease of travel back to your home country? definitely take some time to think about these things and keep them in mind as you research.
best wishes on your journey! hopefully you get some time to travel and see that there are some truly wonderful and vastly varied cities, cultures and people here.