Which is a better course to pursue among MBA in IT, big data and ethical hacking?

Go for MBA in IT services. It has lots of scope and very good packages as IT companies are hiring students from management in bulk.

MBA in ethical hacking. According to Nasscom, India will require at least 77,000 ethical hackers every year whereas we are producing only 15,000 in a year, currently. So, this makes the best option for a student if rightly selected.

According to me, the best option for you out of these 3 is big data analytics. Major business giants are looking for professionals in this field. Since it's a difficult branch and nobody likes to spend a huge amount on studies this course has a huge demand in the market.