I'm going with whatever rainier2004 thinks.
If the Cady is tougher than Pratt or at least equally as difficult to find, why is there such a huge price disparity between the two? I'm surprised the prices haven't adjusted over time as collectors have realized that Cady is just as tough as Pratt (ie. either prices for Pratt cards come down to Cady levels or Cady cards go up).