I am a rural hukou in Huaiyuan, Bengbu, Anhui. Now I bought a house in Bengbu. Is it better to move your hukou to Bengbu city or stay in the countryside?

Moving your household registration to the urban area will be beneficial to your future employment, medical treatment (medical insurance), household registration and family education. Staying in the countryside depends on whether there is any possibility of land acquisition and demolition in the future, so that the hukou will be subsidized there. If you can't get anything from you, move to the city quickly.