I know that customer satisfaction doesn't count for much in airline thinking but when it comes to comfort the triple is a complete dog compared to the 380. The 380 is much quieter, doesnt have the irritating 'hunting' sensation on the triple with the sense that the fans are always trying to shift up or down a few revs, is much more spacious especially in Y , has much much better cabin conditioning and does away with 'post long haul headache' and is much more stable in terms of ride, 777s seem to me to wallow along yawing gently .
I will be honest and say I have never been a fan of the 777 and always preferred the 74, it is a great piece of engineering in terms of reliability and economy but pax comfort was a retrograde step in my view. No doubt a 77X will have improved cabin conditioning but I wouldn't fancy being down the back of one when it gets a bit bumpy.