I am having trouble deciding between them. I contacted woodys and they said they are the same material and will be just as durable. Same 60 degree carbide point. The head is different - 1/16 larger with the machined head on the GD. That is why the GD is slightly more expensive. Please let me know your thoughts. For a 01 tcat thinking of 192 1.175 or 1.325. Thanks agian for your input.