UA are first class i flew them in 2001 LHR-JFK-LHR on a 777-200 and i must say they are some of the best flights i have ever had. Comfert is 10/10, food is 10/10, entertainment 10/10 with PTV’s, complimentry drinks and snacks and of course excellent crew and 777s are brilliant planes.
Why go with Virgin when you can get an excellent experiance with United.