Haven't flown those on BA, but the A350 is much quieter than the B777 and would be my choice for that reason alone. You're also likely to have a newer cabin, unless BA refurbished the 777s. Our flight between Denver and Heathrow is on an A350.
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The A350 offers the ultimate passenger experience even on the longest of flights. Its innovative design delivers a true feeling of spaciousness, with wide seats, high ceilings and alluring ambient lighting.
The Boeing 777–300 ER is about 7cm or 3 inches longer than the A350–1000 and has a 5cm or 2 inch longer wingspan. The 777–300 ER is also taller by about 4 feet 8 inches or 1.4 meters and has a fuselage that is wider by about 4 inches.
The sound pressure levels of Airbus A380–800 were lowest among selected models, while the in-cabin pressure level values of Airbus A350-900 were maximum.
Cracks in the painted surface exposed gaps in a sublayer of A350 lightning protection, prompting its regulator to ground 29 of the jets. Airbus, based in Toulouse, France, has acknowledged quality flaws but insisted the jets are safe.
The A350 offers a new generation dual Head Up Display which provides pilots with enhanced situational awareness, projecting aircraft trajectory information on the external world, easing transition from IMC (Instrument meteorological conditions) to VMC (visual meteorological conditions) conditions.
1 Airbus A380The Airbus A380 is the largest commercial passenger aircraft in the world, as well as the quietest widebody airliner currently flying. The A380's double-deck design and advanced noise-cancellation technology make it one of the quietest airliners in the skies.
Range and flexibility. Surprisingly, for all its size, the A380 can't go as far as the A350. The A350-1000 can travel more than 1,000 km (540 NM) further than the A380. Singapore Airlines has a special 'ultra-long-range' (ULR) A350-900, which operates on the longest route in the world, from Singapore to New York JFK.