Amongst all methods implemented to deconvolve the DRT, RR has been widely applied, but its accuracy still depends upon a regularization parameter that can significantly affect the quality of the DRT and impedance recoveries. In this work, we studied six scores for parameter regularization selection, including five cross-validation scores and the L-curve. Using an array of synthetic experiments, we showed that the GCV and mGCV scores outperformed the other scores studied.