I am currently Silver on Delta but that will likely end at the end of the year. I am not sure how to maximize my miles on Skyteam, because of where I travel I often end up flying Skyteam but many different carriers.

I live in China, but my family is in Cincinnati and with Delta's hub in DTW, and sorta hub really focus city in CVG, I usually fly Delta over the Pacific for the long flight.

In the previous year I have flown:
4 long hauls between China and the US on Delta.
6 short haul intra Asia flights on China Eastern.
4 short hauls on China Southern.
4 flights on Aeroflot, 2 between Beijing and Moscow, and 2 between Moscow and Europe.
1 short haul on KLM.

Even when I pay for first class tickets on China Eastern, I don't get many Delta miles. I only recieved about 2500 miles for my round trip PEK-Europe on Aeroflot. But, like I said Delta almost always takes me over the Pacific. China Eastern's website is pretty vague on earned partner miles. Should I switch to China Eastern, or do the 4 ultra long haul TPAC flights I take every year on Delta make Delta the best choice.

I have never seen a good price and schedule on China Eastern from China to CVG.