Out of the three you list, UBC would be my choice for an international student without question. It’s in a major cosmopolitan city with a huge international student population. It has the best reputation within Canada and internationally.
Queens and UWO are in small Ontario towns. Both towns and schools are not diverse. There is little to do off campus.
Is there a reason U of T didn’t make your final list? It would be my top pick of the ones you were accepted to.