The main difference between the Engineer and the manager. The Engineer makes the stuff and the manager examines and the manager manage the employees. The relationship between the manager and employees should be good even though it goes bad, it affects the selling of the product and losing of customers.
The manager has the much more and authority in the company as compare to engineer. The manager is the one who appoints the engineer in the particular project. In the project the engineer as well plays a crucial role without the engineer the project is undone. At my point of view, both of them have equal importance in the company and the relationship should be good between them