Both are the good options, You can go as per your interest. Masters in mass communication you will have to choose one subject as your specialization and if you select Master in advertising and public relation you will have to do your specialization in the same subject.

Media and JOurnalism cover many specialised domains/fields. You can either go into productions, events, advertising, digital media, print, radio, writing, anchoring, reporting, designing. It is a vast feild to choose your career in; and every career is best, depending on how passionately you work for it.  You can read about all such fields and select the most suitable and interesting option for yourself.

Public Relation industry is usually associated with glitz and glamour. But behind the sheen of glamour is pure hard work, thinking on your feet constantly, trouble shooting and having the responsibility of building an image. At all times, communication must be clear and credible between the public and the client. The target audience can be consumers, general public or government bodies.

Good Luck!