Hello,
This is the common question asked by almost everyone before persuing engineering from any particular branch.
Firstly i would highlight that every branch has its own importance in the future. If any one branch is diminished the engineering would be incomplete.
Computer Science - We all know that without computers we cannot imagine our life. All the works that are being performed automatically would stop.
Electronics - It provides power to the whole world. So it has a great importance.
Civil - The house we live in and the roads we drive on are all because of civil engineers.
Mechanical - Machine that we use to make our work easy in our hectic schedule and the vehicle we drive are all because of mechanical engineers.
But i would suggest you to opt Computer Science stream. All its importance and scope for future has already been discussed.
I hope this would help you. For further queries please feel free to write me down in the comment.

Hello,

Engineering is one of the field with better prospectives. In future there are better scope for biotehnology, biomedical engineering, chemical engineering, chemical engineering, plastic engineering, computer science and engineering, electronics, aerospace engineering. You can choose any one of the following if you have fear of a good career in future. Mechanical is one of the discipline that has demand now and then.