Science

If you want to compare Hadoop with SAP HANA then my answer will be both as they have a very good exposure but still companies prefer to have Hadoop specialist.
From technology understanding, you may refer to the following link
http://scn.sap.com/community/hana-in-memory/blog/2014/02/01/hana-vs-hadoop-showdown

MBA and M.Sc are two different streams. MBA belongs to the management field, and M.Sc belongs to the technical field. If you want to be in technical space, opt for M.Sc and not MBA, and vice versa.

After doing your B.Voc in agriculture, you can get a wide variety of jobs. In the government sector, specialists in this field can be employed by the central and state departments of agriculture. As agriculture is a state subject, graduates are recruited by the Department of Agriculture in states for development work with regard to crops, seeds, farm implements, and extension.

TERI University will be a very good option for you to pursue part time PhD. You may refer to following link for further details: http://www.teriuniversity.ac.in/phd-energy-and-environment

, qualifying NET is not easy. You have to work hard so start preparing now. All the best.