Hello aspirant,
For many years agriculture was a science subject only.
Slowly and gradually people have understood the managent aspect of agriculture.
It totally depends upon your interest.
Find out in what you are interested in.
However, if you want to be a researcher/academician in agri science then you should go ahead with msc agronomy.
If you are interested in managent and stuff then go ahead with agri business management.
All the best.