Is Ramesh Singh or Sanjeev Verma better for Economy notes for UPSC?

The choice depends on your background and time.
Sanjiv Verma is generally better for beginners due to its brevity and simple language. It focuses on conceptual "why" and "how," making it easy to finish and revise quickly.
Ramesh Singh is a comprehensive, encyclopedic resource. While it covers every technical detail, its length can be overwhelming and difficult to navigate.
Use Sanjiv Verma for a solid foundation and fast completion. Supplement it with technical data and current updates that both books might lack.