The RTW will give you much more time in CX D or F... check out the OneWorld Forum for the nearly universal opinion about howmuch that's worth... If I were going to spend two weeks flying... even in Y, I'd do it with as much CX as possible.

Also, if you makle the RTW in the right (Westbound) direction, you don't lose half asmuch time as you otherwise would to time-zones.

FWIW.