My only long haul flying has been to/from the US so can only take it from that perspective.
My first flight to/from the US was with United , on an aging plane with no individual seat screens, or flip down screens.
Service was nothing to make me rush back to using them.
Since then the flights have been with QANTAS, and in the two decades or so of flying with them, can't recall any significant delays/cancellations. No issues with customer service both in the air, and on the ground.
Domestically in the US, AA isn't perfect but in general does a good job of OW status recognition. Just wish the additional baggage limits based on QF FF status transferred across to AA, and actually got a meal/snack provided in whY on all services, not just a handful of trans continental routes.
Domestically , when Virgin first came on the scene I did try them, but the idea of paying on board for snacks at the time just made it seem like a glorified LCC to me.