Which would be the best option for me Diploma in engineering (JEXPO) or BCA ?

BCA will be better and so, don't do a diploma. If you have do diploma, you will not be called as bachelor students. So, don't waste time in doing a diploma. Diploma is not a standard course.

Hi, Bachelors in Computer application (BCA) is one of the popular options to make a career in information technology. It is an undergraduate academic degree in computer application. The duration of this program is three years. It is equivalent with B.Tech/B.E in Computer Science or Information tech