There isn't really a "best" undergraduate degree for product marketing or product management, as many different types of degrees can be beneficial. However, some degrees that may be particularly helpful include marketing, business, psychology, and sociology.
Marketing degrees can give you a strong foundation in the principles of marketing, which can be very useful in product marketing. Business degrees can also be helpful, as they can provide you with skills in areas such as finance, accounting, and project management. Psychology and sociology degrees can be beneficial as they can provide insights into human behavior, which can be helpful in understanding consumer behavior and developing marketing strategies.
Ultimately, the best undergraduate degree for product marketing or product management is the one that is most relevant to the specific career path you want to pursue.