Which is better, Hangang, Laigang or Anyang Iron and Steel?

Hangang belongs to Hebei Iron and Steel Group. I specialize in steelmaking. Our company has a partner who recommended Laigang. I have been in Angang for three years, and the city is too dirty for people (Henan people) to eat. It is not recommended to cooperate with Laigang now. Hangang is also cooperating now, but the salary seems to be not high.