The systemic approach and the circular approach are two different approaches that aim to address sustainability and resource efficiency.
A systemic approach is a holistic approach that considers all aspects of a system, including its interconnections and interdependencies, and looks at how changes in one part of the system can impact other parts. In the context of sustainability, a systemic approach considers the environmental, social, and economic impacts of a system and seeks to create a balance between these three dimensions.
The circular approach, on the other hand, specifically focuses on the efficient use of resources and waste reduction, with the goal of creating closed-loop systems where materials and products are kept in use for as long as possible. It is based on the principles of the circular economy and seeks to create a regenerative and sustainable economy.
So, while both approaches are concerned with sustainability and the efficient use of resources, the systemic approach is broader in scope and considers multiple dimensions, while the circular approach specifically focuses on creating a closed-loop system for materials and products.
I personally find using elements of both approaches to provide a unique value between holistic and commercially efficient elements for the overall sustainable outcome.