A330/340 for me with the 2-4-2 configuration, couples chair by the window. A350 lovely aircraft as is the A380. B777 okay in 3-3-3 configuration but too tight in 3-4-3, check on SeatGuru before booking.
B787 okay for short haul in 3-3-3, certainly preferable to a narrow body, but too tight for long haul.
I would rather have 2x 7 hour legs in an A330 with a 3 hour connection in the middle where I can have a session in the gym and something to eat in the lounge than endure a 14 hour direct flight crammed in like sardines. For ultra long haul a night in the transit hotel in between two 10 hour sectors is essential and far cheaper than business class.
Choose you airline, aircraft type and flight timings carefully and you will feel the benefit on arrival.