The best fields should be listed according to your interest.
According to myself the best are: Aerospace, Aeronautical and Mechanical Engineers (But that's really a matter of interest, and cause I'm all three :D)
If you think widely choose these roles:
Aerospace engineers
Develop aeroplanes, spacecraft, missiles, and other vehicles and machines that fly here in Earth's atmosphere or in outer space. Aerospace engineers who specialise in aircraft are called aeronautical engineers, while those who focus on spacecraft are called astronautical engineers.
Agricultural and biological engineers
Combine their expertise in engineering technologies and biological sciences to develop, for example, agricultural machinery and structures. They also work to solve related environmental problems, such as soil erosion, and create new ways to use agricultural byproducts and natural resources.
Biomedical engineers
Use their knowledge of engineering, medicine and biology to find creative solutions to medical and health-related problems. Some biomedical engineers, for instance, design devices for medical procedures, while others develop artificial organs or artificial joint replacements.
Chemical engineers
Combine engineering and chemistry principles to study the production and uses of chemicals in a wide range of practical applications. For example, it is often a chemical engineer who works on improving food-processing techniques or developing better fertilizers.
Electrical and electronics engineers
Work with a wide range of technology that many of us take for granted and on which all of us depend. Designing, operating and refining devices and systems as diverse as the networks that underpin mobile communications, energy and national defence systems to the smallest devices imaginable in new areas such as nanotechnology.
Electrical and Electronics Engineering is all around us and provides a rewarding career for those interested in a technical, management or project management role.
Environmental engineers
Use their backgrounds in engineering, biology and chemistry to solve problems that have an environmental element. They can be involved in everything from controlling water and air pollution to creating effective recycling programs to conducting studies on hazardous-waste management.
Industrial engineers
Typically work in manufacturing facilities, making sure that organisations produce their products as efficiently, cost effectively and safely as possible. Some industrial engineers are involved in designing production processes and factory-floor layout schemes. Others address work site or product safety and health issues so that both workers and the consuming public are protected.
Marine and ocean engineers
Design, build and maintain ships, aircraft carriers, submarines, tankers, tugboats and other large waterborne vehicles. A marine engineer, for example, might select and maintain the machinery on a large ship, while an ocean engineer may be involved in designing and operating an oil rig that's been built out at sea.
Materials engineers
Develop the materials used to create various products. They work with metals, ceramics, plastics, semiconductors and composites to develop everything from clothes and vinyl siding to dinnerware and artificial limbs.
Mechanical engineers
Design tools, engines, electrical generators, internal combustion engines, elevators -- in short, any device that is mechanical in nature.
Mining engineers
Focus on locating, extracting and processing coal, metals and minerals so that those materials can be used by manufacturers and utility companies. For example, a mining engineer may develop a site-specific approach to extracting a mineral deposit efficiently and safely.
Nuclear engineers
Determine the processes, instruments and systems necessary to tap into nuclear energy and radiation. Some nuclear engineers might design nuclear plants, for instance, while others may develop nuclear power sources for spacecraft or innovative diagnostic procedures for physicians.
Petroleum engineers
Oversee searches around the world for new sources of oil and natural gas. They also figure out how those natural resources will be extracted and design the equipment and tools necessary to do so.
Hope this was helpful. Read about these and decide! Good luck....