My city: which is my team...

With the Western Sydney Wanderers joining Sydney FC in the A-League this season, Sydney suddenly becomes a 2-team city. Now the question is where does my loyalty lies? I live and have grown up in western Sydney but does that mean I my loyalty is with the Wanderers? But off all the teams I follow, none are my hometown team. Then again my wife asks "do you really need to follow a team"? Well I have until October to decide...