The seats are the same (if the 777 has been updated), the 777 aisle is narrower. Which one? It depends what you want. 15 A and K are my favourite - back of the cabin, so no-one walks past, you don't get bumped by the crew using the aisle, you can see out the window, but you are last for the drinks cart and meal service. Avoid aisle seats in row 9: D and F are the ha-ha seats. On night flights if there are no windows I take the centre seats because they are quieter, no-one climbs over you and you don't get disturbed by people in the aisle, again, row 15 if I can. I try and avoid rows D and F (inner aisle) because you get a freezing draught down the back of your neck - well, you do if, like me, you are 1.80 m. This is true of the 777 in every configuration I have flown. If you want to face forward, you have to take an aisle seat.
Window seat next to the emergency exit (row 62?) on the upper deck of a 747 is still the one to beat!
Have just concluded I am a sad bastard.