I've flown both the B747 (200) and the A340 (300 and 600) and I'd rather have the Boeing in a strong, gusty crosswind any day! The lower wingloading of the 340 makes it a bit bouncy on a gusty day, and the 600 in particular can be a real handful because of slow control response and spool-up. The demonstrated crosswind limits on the A340 are quite high (33kts for the -300 and 37 kts for the -600), however. Due to the length of the -600, the flight deck can feel like it's over the grass before the drift is kicked off!