Boeing last week said additional regulatory scrutiny of the larger 777X planes following the Max crashes as well as weaker appetites for new jets from customers amid the Covid pandemic contributed to delivery delays of the wide-body jetliners.
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For one, the Airbus A380 has almost double the space onboard compared to the Boeing 777 series, thanks to its second level. This means the airline can afford to be a little more abundant with its first class and business class offerings onboard the A380 compared to the Triple Seven.
In general airliners cannot do sustained inverted flight as they lack a fuel system (and lubrication system) for sustained inverted flight. A barrel roll is readily executable. Youtube has a video of Tex Johnston doing a barrel roll.
For Emirates, which currently maintains a fleet exclusively of Airbus A380 and Boeing 777 aircraft, the future is clearly the 777X. For this reason, the carrier has placed a massive order split between 777-8 jets to replace aging 777s and 777-9s to replace its Airbus Super Jumbos.