which degree can I get more money fromWatch
Accounting and finance
Business and management
As someone who has an accounting degree, you don't really need one if you want to become an accountant, the graduate schemes don't mind any degree as long as you get a 2:1 usually, but it will make things easier as you get professional exam exemptions. I would say this is where the most money can be made. If you manage to become chartered with a good company, it will be quite easy making £40-£50k, especially when you leave for industry jobs. That said, if you're not sure what you want to do, I would go with marketing as imo business management seems a bit too general/broad and not specific enough.
which one would employers prefer, a business a management degree or a marketing degree
You are worrying over the wrong end of the situation. You need to look at a range of accounting jobs, business management jobs and marketing jobs and decide which ones interest you most, and suit your skills. They all mostly lead in different directions, though accountants can move into business management quickly and easily. Marketing can move into business management, though later in a career. Business management is the least specific, but that is a weakness rather than a strength, because business management is a general term and it's easy to pick up the necessary skills and experience if you are any other sort of specialist in a company.
Which one makes the most money - generally accounting qualified, because it's a hard skill, but in all three cases, it will depend on your talent and hard work. That's why it's important to make the decision based on your skills and interests.