See in which stream you want to do MBA specialization depends on all your interest.

Still as you are confused about your decision so I will like to tell you that in most of the top colleges after admission for the first whole year you are being taught subjects from all the MBA streams. This way you get a clear idea in which subjects you are comfortable and which stream can be good for your future career perspective. At the end of 1st year you are given choice to select two stream for major and minor specialization.

If you are right now inclined towards HR stream then you can definitely go for doing Major specialization in HR. There are lot of Job opportunities in HR field but growth is a little slow in comparison to other stream. For making it more effective and opening further scope for yourself you can do minor specialization in marketing or Analytics. These two fit pretty well with HR. Still I will say it's better to experience all streams before taking this lifelong decision.

All the best!!