Your school may have some type of survey data on what graduates from the various programs are doing now. That might be something to take a look at.
Also, try to get a sense of how each major functions in an organization. Painting with a very broad brush, marketing has a creative element to it. Finance is about an organization achieving it’s specific profitability. Creativity in finance? Well, not so much and not so good, usually. Economics is more focused on understanding of economic factors, with perhaps more opportunities in public sector than the other 2.
If you’re planning on getting an MBA after, just pick the one that interests you most and in about 6 years when you’re ready for the MBA you’ll know a lot more about yourself and the world to decide how you want to focus that degree.