The Xinjiekou area has more shopping malls and is one of the commercial centers of Nanjing, with big shopping malls and shopping centers such as Suning Ebay Xinjiekou Store and Nanjing Xinbai, as well as many snack bars and food streets.
Hunan Road is mainly specialty stores, with many brand-name clothing stores and department stores, and a food street next to it where you can sample local cuisine.
Fuzimiao is a cultural tourist attraction in Nanjing, with many historic temples and ancient buildings, as well as many small stores and specialty snacks, but is probably more focused on culture and tourist experience than Xinjiekou and Hunan Road.
Overall, the streets near Nanjing South Railway Station are busy and bustling, so you can choose the right street for shopping, food tasting or sightseeing according to your interests and needs.