I've been driving trucks for over 12 years and have driven many different types of trucks and engines. My favorite as far as power/torque and all around grunt has always been the CAT's.
I used to drive a 94 Pete with a 425 B model CAT that at the time was over 6 years old with over 800,000 miles on it. I was moving along I40 in NM with this other driver who had a brand new Detroit Series 60 rated at just over 500 hp, had been raving up and down for the last hundred or so miles about this engine. How great it was, how well it pulled, fuel mileage, blah blah blah.
I'm loaded to the hilt, scaling out just over 79,500 pulling a flatbed. We start to go up this slight grade and he starts slowing down, so I pull out to go around him. I say to him, come on lets go, get that Detroit moving, I thought you said it could pull. He says to me he was letting the cruise control take him up. I just laughed at him and said "yeah right, excuses excuses" as I waved at him as I went by him.
My favorite had to have been my 2001 Pete, it had a C-15 CAT(newer version of the 3406E)that was putting out over 500 hp hooked up to an Eaton Fuller 18 speed. She flew.
By the way, not to offend anyone, but that movie "Blackdog" sucked from a driver's point of view. I know it's just Hollywood, but, yack.