Both the branches are good and has good scope in the future. It's totally depends on your interest which branch you like. If we compare the branches then ECE has more demand then civil engineering.  It is recommended that you should focus on to get top colleges to get good placements.

You can compare both the branches below-

Civil Engineering- This branch deals with design, construction and maintenance of the physical and naturally built environment, including works like roads, bridges, canals, dams, and buildings.

Career after Civil engineering is highly rewarding. It has demand in both public and private sector. If we compare this branch with others then it has less number of unemployment. 

ECE-  is an electrical engineering discipline which utilizes nonlinear and active electrical components to design electronic circuits, devices, microprocessors, microcontrollers and other systems.

It is one of the growing branch. It offers growth and good salary. There is continous growth in this field.

Good Luck!!