You asked a good question. However, the criterion should not be what appears better to the employer, but what meets your career goals and interests.
Different careers and career levels require different amounts of education.
One good way for you to get information is to go to the head of alumni relations at your school and arrange to talk to graduates of your school who majored in you career area of interest. Talk to some who just got a bachelors degree and talk to some who got an advanced degree. See if you get some helpful information about what the person has been able to do with his/her level of degree and see how if fits with your desires and interests.
You should also be aware that there are many instances in which an employer will pay for an advanced degree, so even though an employee might start with a bachelor's degree, advancement might be possible depending upon the situation. It happens more than you would think.
Please let me know if and how this might be helpful. Please keep me informed. I would like to follow your progress.