Electrical Engineering and Automation and Mechanical Design and Manufacturing Automation contact big?

Not much, electrical engineering that specialization is about electrical control, mechanical design that specialization is biased towards mechanical design and manufacturing, involving automation is not much.

If the two choices, it is better to choose the electrical engineering. Mechanical professional employment range is wide, but the employment start is relatively low, and generally favors the design and manufacturing. Mechatronics, automation, electrical control, etc. These are the general direction. Purely mechanical is not appetizing.

Brother is a mechanical professional over the people, or suggest that you choose the electrical engineering it, learn more about the electrical aspects of the control side of things, these than the mechanical content is much higher.