Two retrievers post identical precision@10 and recall@1...

Identical precision@10 and recall@10 scores can mask significant differences in performance. For example, one retriever might achieve high recall at rank 5 while another only achieves it at rank 10. Because RAG systems prioritize the most relevant information for the context window, you should evaluate the rank positions of relevant documents or utilize metrics like Mean Reciprocal Rank (MRR) or Normalized Discounted Cumulative Gain (nDCG) at the specific production depth to make an informed decision.