I'd wager "Holds" and "Saves" and "Blown Holds" and "Blown Saves", WHIP, ERA, ERA+, Strikeout to Innings Ratio, Spin Rate, Beanball Ratio, Curve Vortex Index, Madden Rating, and about a dozen other statistics (whether seemingly legitimate or not
), are more beneficial and useful to arbitration and contract talks, and also the overall assessment of relief pitchers....then Wins, Losses, and Win% are.