MBA/PGDM

Both HR & Marketing are important in business and both require different skill-sets. In my opinion, MBA in marketing would have better scope because:-
1. Marketing is closer to the revenue of a business. Generally, companies consider marketing as Profit-center and HR as Cost-center. If you do well in marketing, your contribution would be easily recognised by top management.
2. I think marketing would have more jobs. As soon as a startup is founded, marketing executives are needed. However, HR execs hiring could be postponed or outsourced till company becomes bit stable. In the same company, size of marketing team would be bigger than size of HR team.
3. Many B-schools don't offer HR discipline, but almost everyone offers Marketing. So, you may get less options to study HR. It could also be seen as a signal about demands of jobs. However, HR has some advantages as well. If everyone starts thinking like the above points, you would get less competition in HR. So, with lesser efforts, you can easily grow in HR career ladder also. By the way, most of the top managers need to learn HR skills over the time, because they need to hire, fire, retain & mentor employees & team. If you are passionate about HR's roles & responsibilities, then there is no harm in learning it.