Phoenix: Knows shopping choices are slim. Sure, there's Biltmore Fashion Park and CityScape, but it's fully understood that both aren't really worth it. Not even Paradise Valley Mall.
Scottsdale: Realizes it has the best shopping scene in Arizona, and doesn't have to say much more than "Scottsdale Fashion Square" or "Kierland Commons" to make a solid argument.
Phoenix: Knows that it's home to the Arizona Diamondbacks' stadium, and is damn proud of that -- largely because the team won the 2001 World Series (and probably because the stadium isn't in Scottsdale).
Scottsdale: Gets a lot of city pride from a lesser-known team: Scottsdale Community College's Fighting Artichokes. And yes, an artichoke is really the mascot.