1. The monthly salary of Guangxi Chen Shi Construction Engineering Co., Ltd. is 4,000 yuan, and that of Yishui Chenniu Decoration Materials Co., Ltd. is 3,000 yuan.
2. Guangxi Chen Shi Construction Engineering Co., Ltd. has two days off every Friday, while Yishui Chenniu Decoration Materials Co., Ltd. has one day off every Saturday, so Guangxi Chen Shi Construction Engineering Co., Ltd. is better.