I would recommend for long haul flights to choose the TK - a great lounge in Istanbul, daily flights to many cities in Italy and Shanghai / Beijing / Guangzhou / Hong Kong. Also, TK intends to add more cities in China this year.
And many flights to Asia(India, Egypt, etc).
Status typed easily supported and maintained as well.
The use of miles, not bad(if make booking on TK flight).
Co-brand with the Italian banks haven`t.
Or Aegean - Gold for only 2 trip to China in the economy. Spend miles worse.
If the priority of using miles - it USA Star companies - US and UA.
At US you can buy more miles at good prices and in the UA to take a one way ticket.
Intra China - sometime I use Delta miles for one-way award flight(9000 miles+few dollars). Also, have many promo in year for buying, transfer miles.