Which engineering branch is best?

It depends upon your interest. If you like electronics field then you should pursue B.Tech in electrical and the same goes for other branches. All the branches are good.

Best branches in terms of rank: 1. Computer Science & Engineering/IT 2. Mechanical Engineering 3. Electrical & Electronics Engineering 4. Electronics & Communication Engineering 5. Civil Engineering 6. Chemical Engineering 7. Architectural engineering

There is no single best engineering course. It depends on your passions, talent and skills. Rather than trying to figure out which is better in general, you must figure out about your interests. Read about all streams and then decide what would you like to do ten years from now.