I am in the USA right now, and have been a BA long haul customers for many years, using them over any other. With all the strike nonsense going on, I have started using other carriers, this time Virgin and to be honest the overall experience is in my opinion better.
I would avoid Delta like the plague having had a cockroach on one of their flights and a CC who told me "well you sure squished that!!!!"
For me either BA (once the industrial action is sorted) or Virgin. My personal issue now is whether to go back to BA, my next 4 long haul flights (3 USA 1 Australia have all been booked with other carriers).