Ehh idk I had the best experience with emirates but I was very young then so I don't know how valid my memory is. I remember the plane being nice and clean, food was amazing and since I was a kid I got tons of gifts and shit.
The airline I've been the most on is Qantas and it's pretty meh tbh, Qantas economy is pretty crap and business class had the advantage of no screaming kids but it was still pretty crap.
United Airlines, the best customer service, period.
Best Virgin. Worst Spirit.
Next trip with Turkish Airline and Qatar. Heard that they are good too.
probably Turkish Airlines
Honourable mention: Ryanair