From consumer standpoint, A380 is by far my favorite for cross-Atlantic flights. A340 would be a distant second.
777s layout fits more people then A340 (superior for airline), but 3/4/3 seating just plain sucks for passengers compared to 2/4/2 for A340. More leg room too.
A340 having toilets below deck is also great - fewer smells in the cabin. Sadly, getting a A340 is like lottery and A380 is only operated in a few routes.
Emirates A380 is very comfortable, flying ex-Australia to Europe or USA it's common to get an A380 from either Emirates or Qantas. For Asia, you can get an A350 from Cathay Pacific at very competetive prices.
Seat Width is a big factor, 18" on Emirates and very comfortable seats. I haven't yet tried the 787 though, looking forward to trying the Qantas offering.
777s layout fits more people then A340 (superior for airline), but 3/4/3 seating just plain sucks for passengers compared to 2/4/2 for A340. More leg room too.
A340 having toilets below deck is also great - fewer smells in the cabin. Sadly, getting a A340 is like lottery and A380 is only operated in a few routes.