Which is a better option: BBA in event management or B.Sc in agriculture?

Both the fields mentioned by you are completely different from each other. One will lead you to the management field and the other is to some extent technical. So, be careful while choosing any of the fields as the future will depend only on what you chose today. If you are good in communication ski

Both are totally different field. So, you only can decide about your career goal. If you have interest in management skills, then go for event management and want to go ahead with Science field then go for agriculture.