The 787 is a great aircraft, but I find it more noisy than the A380. The A380 is simply fantastic and by far my favourite aircraft. In my opnion there is no comparsion, the A380 wins hands down.
Looking forward to check out tha A350. I hear it's a very silent aircraft as well. Airbus aircraft always feels less noisy and generally more comfortable to me. That goes for both the A320 series and the widebodies. I also prefer A330 to the B777. the B777 is probably my least favourite widebody. I always feel SO tired and jet lagged after a 777-flight, so I actively try to avoid them. Unfortunately it is not always possible.