Which one is better business management or entrepreneur development?

The answer to your question completely depends on the person and situation. Some people are better entrepreneurs and others are better managers. Some people prefer to work for themsleves and don't mind the risk of entreprneuership, others prefer the security of knowing they have a steady paycheck from the company for whom they are a manager. Some people might prefer the security of management but are forced into entrepreneurship if they do not have employment. So, like I said before, it really depends.