I have flown several airlines. I preferred Ansett Australia, when it was in operation over Qantas. I always had a good flight with them. The overseas airline I have flown include Singapore, which I found had a high inflight standard and Air New Zealand which was OK. I choose airlines for the points I can receive.
I've found Singapore Airlines and Malaysian Airlines are both very good. Their flight attendants are genuinely charming and helpful, and both have very good safety records. About a week ago I flew Virgin Atlantic to the UK (where I am now), and found them quite good as well. The flight attendants were very up-beat and the general mood was relaxed and fun.
I’ve no idea what airline is in the world, but we always fly Qantas, if Qantas are flying where we’re going too! if they don’t go where we’re going too, we can change to another airline, to take us the rest of the way, We fly Qantas, for the staff travel.