In addition to the seating considerations, bear in mind that the superior pressurisation and humidity of the A350 over the B777 will probably mean there's a better chance of falling asleep in the first place and you'll likely feel a lot less ratty when you land too.
Originally Posted by
our_kid
Trust me the AY A350 isn't all that - seat cramped and very poor IFE selection
Trust me that AY has a herringbone layout whcih means that you don't have some oaf climb over you in the middle of the night ....