I went through the pros and cons of those two engines a few years ago when looking for a used truck. I didn't end up with either, but my general feeling was that the chevy 6.0 was a better motor. I test drove a few of each (unfortunately never got to tow anything) and felt like the 6.0 had more ooomph at lower RPMs. That's very subjective, I know, but it was enough to convince me that the 6.0 would handle better overall. Also, people I trust tell me that the chevy engine is easier to work on.
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