Do not just look on what you will make but how hard you will have to work as the teaching and office hours requirement has greatly changed since the times when foreign teachers were respected. Once the uni salary was just about 5 or 6 thousand Yuan monthly which is twice as much today. Equally, the workload has increased. The primary and secondary education offers have similar tendencies, so watch out for how much you can actually take. Ending up with a lot of classes per week could result in lower quality of lessons than you are capable to give. We all are humans but that's not what Chinese employers think.