To comprehensively evaluate the performances of two portfolio managers, each allocated the same amount of investment capital and operating under identical strategies and constraints with undiversified portfolios, consider the following context: Both managers have provided data on their respective average returns, betas relative to the market index, standard deviations of returns, and tracking errors, while the risk-free rate of interest is 3%. Given this information, which performance metric should be employed, and what is the correct inference to draw from the comparison?