Which subsidiary of China Railway Second Bureau is better?

As far as benefits are concerned, except for a few that are not ideal, everything else is similar. The landlord would like to ask which subsidiary has good welfare and high treatment? In fact, the benefits and benefits have a lot to do with the project. Every company has good benefits and bad projects. Personally, I think: No.1 Company, Machinery Construction Company, Yun Xin Company, Shenzhen Engineering Company and No.5 Company are all good.