I agree with the comments above. For couples the 787 is a much friendlier AC especially considering that you need to climb over the aisle seat and the higher pressurization and humidity are noticeable. But for me as a mostly solo flyer I chose the privacy of the 77W when scheduling isn’t an issue.Now if it was an ANA 787 it would be a no brainer. Just on the basis of their hard product. 1-2-1 seating vs 2-2-2.
As for the difference between HND and NRT is like comparing the 787 and 77W and comes down to personal preference.