Most people prefer to switch between DocX and PDF when working on a project. This is because DocX allows for more interaction with the user, while PDF is more efficient when it comes to printing. However, there are some cases where one format might be better than the other. For example, DocX may be better if you are creating a presentation or document that will be shared with others. On the other hand, PDF may be better if you only need to print out your work once. It all depends on the specific situation.