Which is better, SDIC or civil servants?

Both are fine. Its advantages are as follows:

1.SDIC belongs to the official staff recruitment system of state-owned enterprises and is a limited liability company (state-controlled). National Development and Investment Group Co., Ltd. is an important state-owned backbone enterprise directly managed by the central government, a wholly state-owned holding company and the first batch of state-owned capital investment companies. Not a public institution, but a contract system.

2. Civil servants are public officials who are responsible for the overall management of economic and social order and national public resources, safeguarding national laws and regulations, and fulfilling relevant obligations. In our country, civil servants refer to the staff who perform public duties according to law and are included in the state administrative establishment, and their wages and benefits are borne by the state finance.