One of the most noticeable differences is in the cuisine. North Vietnamese food is like the calm and peaceful monk, all about simplicity and tradition. Think pho, think bun cha, think all the delicious street food your taste buds can handle. South Vietnamese food, on the other hand, is like the life of the party, all about fusion and experimentation.
For example, have you ever tried Banh Mi? It's like a party in your mouth, with pickled veggies, grilled pork, and a dash of French influence. That's South Vietnam for you, always mixing and matching to create something new and exciting. North Vietnam, not so much, they like to keep things traditional and simple.