dear student,

Being as a quality person in automotive sector for odd three years I will say all three departments (Production , quality & design ) are better.

In other words it purely depends on your own interest & skill sets you posses.

If you are having skill sets & interest towards design then opt for design & vice versa

We can categorize the departments from top(For ex 1.R&D Design 2.Product development 3.Quality 4.Production) but we cannot say this field is better than this because each field provides the equal opportunities to learn & develop technical skills & at the same time each field have their own pros & cons

Field doesn't matters if you have ample passion to pursue excellence in that particular field sky is the limit.

Thank You!