Question: I want to study a 4-year course. I want to know the highlights of each course and I prefer the electrical and mechanical engineering course.
Answer: If you prefer electrical, then that's what you should do. Both are 4 year courses, for a BSE.
http://www.payscale.com/research/US/Job=...
http://www.payscale.com/research/US/Job=...
The pay gradient for Electrical engineers is a little better as well, but if you preferred mechanical engineering, that would be the gig to go with. Neither do badly.
Others: