I'm looking into either getting a DONE4 or something similar (AA's RTW, Circle Pacific, etc.) and one question I keep having is which airline to pick for various segments... e.g which airline has the better business class product. For some routes I think it's clear (take CX over BA on LHR-HKG) but others I'm not sure of. While I'm aware that it can depend on the route, what is the general ranking of business class products in the oneworld alliance?