Hello dear student,
Both have their own pros and cons and
Basically taking admission in any of these courses depends upon your interest. If you want to work in industry you can opt any of these. Both have their own research and development . In bsc agriculture you are only focused on plants while in bio-technology you can go into any direction and you are not bound to do work in oy one direction like processing of alcohol, food processing, research (into the core ) , tissue engineering, stem cell therapy. Name anything and you will find biotech students there..I hope this is helpful
Best wishes

B.Sc agriculture will be a better option Careerwise. The job opportunities after B.Sc agriculture is much better than B.Tech Biotechnology. 

In agriculture, one can bag a job after B.Sc and M.Sc, but in Biotechnology you need phD.