Which is the best branch of engineering?

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.

The definition of best varies from person to person and is influenced by personal inclinations and one's strength for e.g. some people might to go with regular stream like CS, mechanical, Electronics and some might go with not so common branches like Robotics, petroleum, mining. Opt for the enginee

CSE is the most demanding branch.

B.Tech in CSE is the best.