In general, I prefer the pmCO BC seats to any of the pmUA ones, though the 747 upper deck comes close and has a nice ambiance all its own (plus the window-side storage negates the computer bag storage problem of the pmUA seats). I have an additional reason to prefer the EWR route, finding that it is easier for me to sleep on flights that go to the "right" of the pole and spend more time in darkness, rather than the westbound flights from ORD that are generally always in the sun. Idiosyncratic, I know, but there you have it. I have a flight to PEK out of ORD in October and will choose to fly to EWR for this reason (and to eliminate any chance of getting into the dreaded middle seats of the 2-4-2 configuration). Just pray my GPU comes thru...