Ask for advice! Which is better, Changsha Foxconn?

Then the landlord is from Changsha, and I also got the offer on the 23rd. The salary is really not high, and the treatment is not very clear, mainly because it is still under construction, so I have been hesitant. The overtime hours of different departments are a little different. Our seniors have to work overtime at least three days a week, plus two hours a day, every Saturday for two weeks. Overtime is unpaid. If there is anything else, he has to work overtime voluntarily. Master of Foxconn 3000 (engineering), 500 plus one if you become a full member. Overtime at ordinary times is 1.5 times the salary, twice on weekends and three times on holidays. But after all, Foxconn's income will still be lower than Sany. In addition, Sany's five insurances and one gold are calculated according to the basic salary of 850, so the five insurances and one gold are very low, the housing provident fund is only 50, and the personal tax is 6000! Generally speaking, Sany is faster than Foxconn 1000 yuan (if you add overtime pay, five insurances and one gold, and housing allowance at Foxconn)! I'm thinking about signing it now, and Foxconn only gave me one day to think about it!