Just from a passenger perspective, I am more concerned about seats and noise level.
I had the chance to fly to Narita on a LH380 and back from Haneda on an ANA 787 when it was new in service (before the battery s... hit the fan).
The A380 is exceptionally quiet, and the seats LH puts in economy are ok (but I wouldn't mind if they were an inch wider and had an inch more legroom).
The 787 was unusally noisy compared to the 777 and more so the A330/340 I usually get to fly in. I found the seats, the backs of which do not recline, but the seat bottom of which slides forward, hard to get used to. The extra width was needed to sit diagonally to make up for the poor legroom.