I suppose I have to give credit to the Ford and GM engineers. They have done a fine job of pumping up the horsepower and making their trucks perform.
Everyone likes to be the fastest up the hill, but if that is all that is important to you throw some aftermarket injectors, a fueling box, etc. , and you will whip 99. 9% of the trucks on the road with your CTD.
Reliability, fuel economy, longetivity are more important to me. I hate to beat the issue up, but the Ford has an unproven engine, GMC's Isuzu engine hasn't been put to the long term test quite yet, and neither get quite the fuel economy that the CTD does.
Ask yourself. You are halfway up the ALCAN highway with a 13,000 lb fiver in tow. Which truck would YOU rather be driving.
Like the old Timex commecial - "It takes a lick'in and keeps on tickin". That is how I feel about my CTD.