Both became cities in the late 19th century, both have a population of slightly more than one million, both are river cities, and both have a young population (the average age is the mid-30s).
Both have a highly educated population, both have residents who love their parks and recreational areas, and both are winter cities.
http://www.househunting.ca/calgary/real-estate/article-archive/East+meets+west+tale+cities/7869345/story.html