I am the exception here. I like both Boeing 747 and Airbus A340, but Airbus A340-600 is not a bad choice either. The width of the Airbus A340-600 seems to improve a bit, and having a cabin with only 8 F seats may make the service a bit more personal.
Anyway, the nose experience is pretty unique too in Boeing 747... but I guess what I am trying to say is that both aircrafts are fine...
But sometimes it may be more interesting to fly a brand new aircraft Airbus A340-600...