I would suggest you consider Learning & Development. Firstly, because you will find every second or third person working on projects related to Recruitment. Secondly, in the area of Learning & Development, you will find huge potential and scope for improvement, as well as for upgrading your knowledge. Also, regarding recruitment, it is more of a background activity for project purposes, whereas concerning Learning & Development, it would involve a more interactive method with all the people involved.
If you have a technical background before joining your MBA, then you have a better option of pursuing both technical as well as behavioral/attitudinal training. If you are from a non-technical background, you will need to emphasize and put in a bit more effort to work on the technical part of the training. Initially, I have my doubts about whether somebody in the firm will solely help you with behavioral training exercises.
Hope my suggestions will help you choose the better option without confusing you.
Regards