Hi Theva!

If you are interested in vehicle designs in detail then Automobile engineering is best. Automobile engineering deals with the design and creation of vehicles used as means of transportation by road. Essentially, it derived from mechanical engineering. It is a combination of different elements of mechanical engineering, electrical engineering, electronic engineering, software engineering and safety engineering. It has good scope and and best career options also. If you are interested in PSU then best option is Mechanical engineering. So, Think wisely and decide based on your interest.

Hope this helps.

All the best!