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Assuming the same relative errors on the angles $(\\alpha,\\beta,\\gamma)$ and the sides $(R_b,R_t)$, we find that the pairs $(\\gamma,\\beta)$ and $(\\gamma,R_b)$ are most efficient in determining $(\\bar\\varrho,\\bar\\eta)$ that describe the apex of the unitarity triangle. They are followed by $(\\alpha,\\beta)$, $(\\alpha,R_b)$, $(R_t,\\beta)$, $(R_t,R_b)$ and $(R_b,\\beta)$. 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