Hi Lakshmi,
It is always better to opt a Btech degree when compared to BCA. It will give you more job opportunities. The subjects covered is almost the same in both the courses, so being an average student doesnt have to do much while choosing. And the Btech degree have higher value, so better to choose btech. You can either go for a Btech in Computer Science or Information Technology.
Wish you goodluck.