I would like to say, initially it's not about we choosing the Department,it's actually the what we get ,once you get your first job and entered in a department have a self analysis about how well are you performing in that particular department and your level of passion to work. If everything is fine then that itself will take you high.. specifically if I need to say ....
Quality is the department where u will be responsible for ensuring quality standards as per the requirement, inspections,approvals,gauges, documents etc,,,as well as you will gain pratical process knowledge which definitely helps to solve the problems,if you are good at measuring instruments and has a attitude to drive the things in a right manner you may choose quality.
Marketing is like a bridge between you and the customer whom we supply the goods, it requires handling the customers,coordinating them in a compassionate way, generating leads, increase sales , keeping the relationships for long term etc,,,if you have good communication , convincing skills , ability to sell a product then marketing is the right place for you
PPC is for people who are good at planning and organising the things well ,it requires ability to plan the production house to get what customer needs in a effective way , coordinating with various departments , follow ups , inventory management ,it calls for those who have leadership qualities and who are organized themselves.
So keep trying good luck