Singapore Airlines is probably the most consistently good. Emirates is inconsistent. Etihad not bad at all. Thai is also good. Qatar is good. And - gasp - I actually love the homely, familiar and friendly service offered by the senior crew at the front in F class on Air-India's new Boeings!! They may not have all the latest gizmos and gadgets and super technology. But, hey, I've got all that at home anyway. When I step on a 'plane, I prefer the human contact element of Customer Service and a break away from the day-to-day gadgets. Hence I've mentioned Air-India.
And BA is also hard to beat.