Which branch of China Communications Tunnel Engineering Bureau has good benefits?

The first company of China Communications Tunnel Bureau is located in Beijing, mainly engaged in projects around Beijing and northeast China. The second company used to be in Henan, but now it has moved to Tianjin. There is no way out. The third company used to be in Qingdao, but now it is in Nanjing (I worked as a manager in the third company). The benefits of the three companies are not bad. At least, the salary is the highest in the engineering unit. The first year after graduation, during the internship, 2000 yuan. There are about 6,000 chief engineers, 4,500-5,000 department heads and 6,500-7,000 project managers. The fourth company is in Chengdu. I don't know anything except three companies, and I dare not talk nonsense, but I heard that it is not very good. However, as the country stimulates domestic demand and vigorously builds, as long as there is a big bid in the bureau, all companies will distribute it equally. You can join any company as long as you are talented. There are few people in the company now. As long as you do well and rise quickly, you will be the veteran of the company in a few years.