Every Canadian university is an excellent university. However, there is a positive correlation between reputation and age of the university.
University of Toronto, McGill University, University of British Columbia, University of Alberta, McMaster University, University of Montreal. CWUR 2016 | Top 1000 Universities in the World
Are we talking distance learning or in general? University of Waterloo has good DL programs and is considered a very good school. My alma mater McGill University is good but does not have much DL presence. University of Toronto has some continuing education DL programs. Athabasca University and Thompson Rivers are mainly DL universities with good reputations.
This may be one of the better links to online education in Canada. It has basically been unchanged for a number of years. Distance and Online Degrees, Diplomas, Certificates : Canadian Virtual University