I guess it all depends where to.
Over the pond to and from blighty, BA.
To distant Asian horizons, always liked SIA, but have just flown Qatar for the first time LHR-DOH-KUL and back in Business...now if those seats were true flat beds, they would be untouchable.
To the dark continent, SAA, but even they are sadly not the airline they used to be, especially now the 74's have gone
Try to avoid:
US Airlines - A mystery so many remain in business
Lufthansa - A lesson in how to cover every available surface in GREY
Ryanair - I'll use my PA-28 if I want to fly to a field