BA (except when they substitute a Qantas flight in its place - Qantas are bad by comparison) or Thai Airways. I dislike Singapore because although they are efficient and have good aircraft, they have stuck up attitudes (memories of being told I could not use their business lounge in Singapore as I was departing on Silk Air, their subsiduary!) and their cabin staff do not know how to deal with louts (they offer other passengers being afflicted by louts asprin, ear plugs and eye muffs) - Thai will have two of their male staff come and let trouble makers know to stop. I have never done the trip with Lufthansa or Iberia but suspect they would be good too. Garuda; ditto, not on your nelly.

__________________
There are two categories of travellers, those that experience a country and those that take their home with them wherever they go.

Be warned, as with any forum, picking a fight with the admin guy is not recommended!