Varun's response identifies several relevant metrics for measuring the success of SEO and PPC campaigns, such as PPC, CTR, CPA, traffic, and bounce rate. However, the response lacks clarity and depth, as it does not provide a structured explanation of how these metrics were used to evaluate campaign effectiveness. The benchmark response, on the other hand, is comprehensive and well-organized, detailing specific metrics for both PPC and SEO, along with explanations of their significance. It also highlights the importance of customer engagement metrics and how they inform strategy adjustments. To improve, Varun should aim to provide a more structured and detailed explanation of the metrics used, their relevance, and how they contributed to evaluating the success of the campaigns.