Are you asking from the passenger or airline perspective?
As a passenger, I really couldn’t care less whether I fly a 777 / 747 / 380 or whatever. What counts for me is the product.
The airlines will buy whatever proves to be economical and has the ability to make profit on the route.
I think there is far too much hype about the new models, in most cases, passengers get on an airplane and are clueless what aircraft they are on… what matters though is what’s on the inside…