I just typed a monster reply but it disappeared somewhere into the ether!
In short, I needed a new challenge having done five years on the 777. I could have waited another five or six years and changed seats but it would have meant eleven years in the same seat. I'm also flying with some brand new co-pilots, straight out of flight school with a couple of hundred hours and it's great to be able to bring those guys along and let them learn from my mistakes.
As to the Boeing/Airbus debate, I'm a Boeing guy through and through. The A319/320 does what it's designed to do very well (quiet, efficient, quick) but it is far from being a pilot's aeroplane. Airbus tried to answer a question that nobody had asked and in my opinion came up with some solutions simply to distinguish themselves from Boeing.
I consider the Airbus philosophy to be that "the aircraft knows best". For example, a bank angle limit of 40 degrees (can't remember the actual limit) could not be exceeded without failing a couple of flight control computers, requiring you to press a few buttons. Fair enough, unless you need 41 degrees of bank to miss the guy coming the other way. The 777, which is comparable technology (FBW, etc), makes it unmistakably clear that you've reached a limit but will allow you to exceed it if necessary. That means I'm in control.