I would still go for Warwick than UBC. Warwick is a target school for huge IB and Management Consulting firms such as McKinsey, JPMorgan, HSBC, Citi and like. If you really want a good business degree from a Canadian university, go to Richard Ivey or York-Schulich. But even them as choices, I would still go for Warwick. But that's just my personal preference.
Here’s the ranking of the best business schools in Canada:
1. Richard Ivey School of Business at the University of Western Ontario
2. Schulich School of Business, York University, Toronto, Canada
3. McGill Faculty of Management, Montreal, Quebec, Canada
4. Sauder School of Business, Univ of British Colombia, Vancouver, Canada
5. Queen's School of Business, Queen's University, Kingston, Ontario, Canada
6. Simon Fraser Univ, Faculty of Bus Admin, Burnaby, B.C., Canada
7. University of New Brunswick MBA, Saint John
8. University of Calgary, Haskayne School of Business, Alberta
9. Faculty of Business, University of Victoria, British Colombia
10. Michael G. DeGroote School of Business, McMaster University, Ontorio