Hoping for some advice...

I fly regularly from ATL to PEK. Due to 1k status, I've religiously flown UAL, almost always through ORD.

Recently, though, two things have changed: First, I've achieved DL Platinum status, and second, I've found SWU upgrades on the ORD/PEK flights to be non-existent. And the service in Y on that old-as-dirt 747 sucks. No PTV, no power socket, etc, etc.

Wondering if any folks who regularly fly to China could give me advice on pros/cons of Delta (SEA, DTW) Vs. UAL (DWI, EWR), particularly via route. Presumably econ or econ+ products...

Much appreciated,

Charlie