If you're looking to maximise miles (maybe not since you want S.Am to SWP direct despite having spare segments) then obviously HKG-DEL-BKK-xLHR is over 3000 miles more than HKG-BKK-DEL-xLHR.
And LIM-xJFK-SYD is nearly 2000 miles more than LIM-xLAX-SYD.