Calgarians and Edmontonians will often micro pick at the differences between the two cities, but in reality, they are quite similar. Especially when comparing to American cities, or even cities in Eastern Canada. Out of the three second tier cities in Canada (Calgary, Edmonton and Ottawa), Calgary and Edmonton are the most alike. Employment demographics are somewhat different between Edmonton and Calgary, but not majorly different, and other demographics, such as age and ethnicities are quite similar. The cities even have a lot of the same look and feel when comparing to cities like Hamilton or Ottawa.
I tend to agree about the assessment of Calgary/Edmonton Houston/Austin. I've never felt like Calgary or Edmonton are much like those cities. Us Canadians always like to make comparisons to American cities, but I've never felt much similarities other than maybe visual. From a purely visual comparison, Edmonton's geography and skyline reminds me of Austin, and Calgary geography and skyline reminds me of Denver.