On a typical Boeing 777-300ER, the "best" seat depends on your cabin. In Business Class, seek out the "true" window seats (often labeled A or K) in staggered layouts for maximum privacy; many airlines like Emirates or Air India have updated these to include privacy doors. In Economy, the most coveted spots are the exit row seats (typically in the 30s or late 40s/50s depending on the airline) which offer massive legroom, though the tray tables are in the armrests, making the seat slightly narrower. Another pro tip is the "twin seats" at the very rear of the aircraft where the fuselage tapers; these rows of two are perfect for couples. Avoid seats near the galleys or lavatories to minimize noise and foot traffic disturbances during long-haul flights.