Hello there!
With increasing requirement of Biotechnologists in India and world, B.Sc. Biotechnology is a good course.
The value of the course increases as it gives so much area of higher studies and also research.
Although B.Sc. Cardiology is a good course but it is more inclined towards medical field. Here you need to go ahead in higher studies in order to secure a job.
Whereas there are many companies which offer the jobs just after graduation.
So choose which is under your best possible interest.
Good Luck!