When you are doing original research, there are pros and cons to each of these approaches.
The good side of selecting an established paradigm or framework (which goes along with the bad side of creating your own) is that it is already there and ready for use. You do not have to "reinvent the wheel." If you try to create your own framework, it may be a lot more work. In addition, your framework has not been vetted by the people in your discipline and may have flaws that will ruin your research.
The good side of creating your own goes along with the bad side of using an existing one. When you create your own, you look smarter. You establish yourself as a creative thinker who has something important to contribute to the discipline. If you simply use someone else's framework, you may tend to look as if your thinking is simply derivative of the thoughts of better scholars.