There are many different types of basil that add different flavors. The most popular herbs include Thai basil, cinnamon basil, Italian basil (also Italian sweet basil), and Genovese basil. Each basil has its own unique flavor, Thai holy basil with its purple stem and spicy, anise or licorice-like flavor is a good swap. You can use other types of basil, but you will lose the kick that Thai basil brings to the dish. Thai basil leaves also hold up better during cooking.