Why compare the 380 with the 777? Why not with the 747?
The 380 is made for a specific niche, and I think it may be better on that than the 777, but the 'niche' of the 777 is much bigger ,and it doesn't necessary coincide ,even partially with that of the 380.
. Both planes are designed for a particular type of routes ,and may be the best on their sector.
As the 737 may be more appropriate than the 777 on some paticular flights or area of operation.Or any other example.