even for the day time flight I would prefer the 77W by far over the 772 because
- more privacy
- much larger screen
- USB
- bigger pitch
- functionality of the seat
- more overhead bin space

the width of the seat seems to be pretty similar, that you have less personal space is a illusion. boxed in? well avoid the seats in A and K then and take the ones towards the island (B, D, G, J); also avoid the "honeymoon seats" (E, F) if you traveling alone unless...you know what I mean