Iceman31...
By this time, you know to ignore the all the laughter, because it is not directed at you or your valid question... it is directed at the history of the same question which is more in the minds of regular responders rather than occasional visitors to this board.
I think you hit the nail on the head when you last said maybe you should include gasoline options among your choices. I just paid $2.65 per gallon for 40 gallons of regular gas (with a rewards discount that anyone can get by shopping for groceries at a chain of stores that also sells gasoline).
The lower price of gas, combined with the lower initial cost of a non-diesel optioned truck, combined with more powerful and efficient advances in gasoline engines, has tipped the value scale the opposite direction from where it used to be 15-20 years ago, when diesel was significantly less than gas.
Looking at your signature, I noticed that you have all very recent/new/late model vehicles, with the exception of one jet ski and a dirt bike. If you cycle through vehicles on a 3 year basis, then it seems to me that more of your focus should be on how comfortable you feel in any given cab... since most of your ownership of the vehicle will be covered by warranty.
I think for your pattern of relatively short term ownership tenure, you can trade into and out of a gas truck with cab ergonomics of your liking for a lot less finance and value based insurance and registration costs. With this in mind, the long term reliability of one diesel engine over another would seem to be irrelevant to your usage.
The only practical exception I can think of is your load. How much does that brand new 34' Palomino trailer weigh? How many of the toys on your signature list come with you on recreational trips?
If your total payload is 10K lbs or less, then I'd recommend skipping either 6.7. If your total payload is 15K lbs or more, then regardless of how short of a term you own a truck, I'd recommend you carry on with your comparison of diesels, but consider the amount of time you intend to keep the truck. If you intend to keep it for more than 3 years, then long term reliability is relevant. If not, then it boils down to which seat fits your back better.
