Yew Chung in Shanghai has a good reputation. When I lived in Shanghai (2008-2010), it was considered one of the better international schools. I interviewed with them and was hired for a position in the secondary school, but I ended up taking a job in Malaysia. However, the school is run by a Christian organization, and I have heard that the Christian aspect is quite important if you work at the schools in Hong Kong. Your religious beliefs are not important if you work at the school in Shanghai. You will be very comfortable financially if you accept the position in Shanghai. Plus, Shanghai is an awesome city. I highly recommend it.