how do pro d challengers and ct challengers differ?
Cam Todd was an Innova pro who switched to Discraft. He was a World Champ at the time and one of the biggest names in DG. He wanted a putter like a KC pro Aviar...so Discraft did their best and came up with the Challenger, and then did a run in super-stiff D plastic to try and mimic the feel of the old KC Aviars Cam was used to. They have a cult following now.