So you want to teach in China? Don’t! That’s the advice of 79% of American, Canadian, British, and Aussie teachers according to a recent survey taken by the China Foreign Teachers Union of 500 foreign teachers in Beijing and Shanghai.

China is much more than just Beijing and Shanghai! I've taught in six provinces - Hebei, Heilongjiang, Shaanxi, Shandong, Shanxi, Sichuan, and in Inner Mongolia Autonomous Region. I'd never apply for a teaching post in the two cities you mention, I prefer small cities and towns.

My advice - I recommend teaching in backwaters and small cities to anyone wishing to teach EFL in China. China has much to offer if you're seeking a 12-clock hour/week sinecure of a teaching job for a reasonable salary.