1. Daylighting and ventilation: The house in Dongshan will be much better than that in Xishan, and the house in Xishan will be blocked by the opposite floor, with its back to the sun, so Dongshan is better.
2. Exposure: Dongshan is no problem, and Xishan will have exposure. During the high temperature in summer, the temperature in Xishan House is very high, so Dongshan is good.