Sadly there is no comparison between the A346 & the B777-300ER, the B777 comes "out of the box" a reliable, economical aircraft. The cash discount Airbus give is the biggest admission ever to the financial advantage to the Boeing & what will that mean 5 years down the line when you want to trade them in????
Having worked both, i'm firmly on the Boeing side now (although for job security the Airbus will guarantee engineers lots of work!!).