Looking for a few good opinions out there...

In August I'll be flying JFK-SIN-LHR-JFK in Biz. Looks like the best option JFK-SIN is CX thru HKG. Obviously I've got to use AA from LHR-JFK to get my miles. My question is the SIN-LHR segment - I could go CX, BA, or QF. Who do you think's got the best J class? Who would treat 1W Emerald the best? Anything else I should consider?

Also wondering if I might ought to use this opportunity to get some of the 1W Bonus. This trip will be pretty quick, but I do have weekends attached to each city. Any thoughts on some easy sidetrips that might net me a few more miles? Frankly, every time I try to look at the rules I end up with a headache!

As always, thanks for the help everyone!