As a mechanical engineering, I will have to say I found electrical much easier than mechanical. I would concede ECE to be much more difficult than mech, but electrical is one of the easiest branches in engineering. With its diversity and plain unpredictability, mechanical was much more tougher than electrical which I found to be extremely grounded.
Of course, this is my own personal opinion. If you don't agree with me, I'm afraid you're wrong :)