I dislike the E and F seats. They're only good for a parent and a very young child, in my opinion. Or couples who cannot spend 6 hours without holding hands.
Others may disagree, but for me the best seats on the 4 class 777s are 15 A/B J/K but 2 of these are bassinet seats therefore not available till T-24. The other window/aisle pairs are fairly similar, with 10 A/B J/K slightly better than the others even though the window seats have a misaligned window.