If I only have 2 days 1 night to visit Yiwu and Hengdian, where is better to stay?

You are advised to stay at the hotel near the railway station or the bus station. Fanda Hotel located at no.333, Beizhan Avenue, Houzhai Street is about 300 meters to the railway station. It may charge around CNY150-200/night for a standard room.

Thank you Reiss.
How about if I stay in Hengdian? Do you recommmend it?

Well, you can stay at Guanxing Hotel in No.18 Dongxi Road, Hengdian, and you can reach there by Hengdian bus A/B line. You can also take bus line 1 to Hua'erkangju station, go straight for 500 meters to reach. It may charge around CNY188 or above/night for a standard room. TEL: 0579-89301188