The A380 is OK. The aircraft is quieter than the 787 and at the front there will be little crew noise, especially if you stay away from the laundry cupboard. The cabin is spacious although there is a huge amount of wasted space and the seat itself isn't that big. Still, as far as BA F goes it's the best I've flown.
I haven't yet done BA's 787, and probably wont for a long time yet, but i cant help but think 'business class' when i look at it. It seems extremely tight for a supposed F product.