Bank of China, China Merchants and CITIC all have China Southern Airlines co-branded cards.
The advantages of Bank of China and China Merchants Bank are: they are both UnionPay and MasterCard dual-label cards, which are convenient for overseas use.
The advantages of CITIC are: UnionPay single-label platinum card, which has a higher level of card types. There are many preferential activities and privileges, but they are not convenient for overseas use