What level are you talking about and what is the goal of the judging? I'd say, at some levels - if the goal is to choose future MLB pitcher prospects, I'd go with MPH as the single most important metric. If you are judging a current MLP pitcher, then maybe WHIP or OBP. Started thinking about high school pitchers when reading the original post and could not help but recall what has been said here many times - high school stats don't matter - talent, especially hitting, just too inconsistent across the board.