Different types of chocolate can significantly impact the taste of these bars compared to semi-sweet. For instance, using milk chocolate instead of semi-sweet would result in a sweeter flavor profile, resembling that of a Reese's Peanut Butter Cup. The choice between dark, milk, or semi-sweet chocolate allows for customization based on personal preferences. Dark chocolate provides a more intense and slightly bitter taste, while milk chocolate offers a creamier and sweeter experience. Ultimately, the type of chocolate used will determine the overall sweetness and richness of the bars.