Hi Aspirant!
Both the college's are good for EC. There are placements in both of them. You can compare the two colleges in detail here -
https://www.careers360.com/compare-colleges

Yes, definitely according to me Cochin University of Science and Technology  Kochi, Kerala is much better than the later. But again a govt college has its own advantages. But the staff and the faculty there in CUSAT is fabulous. And after that the choice is yours. Hope this helps. Good wishes!