Hey,

Although the branch selection is upto you but still I would tell you an idea about all the things:-

Firstly ECE is all about physics, if you are intrested in physics like semiconductors, AC and DC currents then you should opt for ECE.

CS is all about computer, coding, programming so if you are interested in IT then you should go for CS.

Now, comparing these colleges altogether in placement wise:-

G L BAJAJ-Avg placement(4lpa), Highest placement (23lpa)

NIET-Avg placement(3.5-4.5lpa), highest package (26lpa)

Galgotias University-avg package(3lpa), highest package(16lpa)

Hope it, helps.

Good luck.