I'm gonna give the low down facts on these three trucks. Pros and cons to all of them that are usually brought up.
I drive these trucks EVERY day in my business. I have the opportunity to see how they are built and how they perform the second the come off the lot.
I own an 03 6.0 Powerstroke. Have around 5700 problem free miles on her so far.
If you want the fastest, you'll buy the Powerstroke. Stock vs stock this truck will win EVERY time. The Durmax will come in second by about 2-3 lengths. The Dodge will be another 2-3 lengths behind the Duramax. I will post some links to tests to support this.
If you want the truck for room. Buy the Ford.
If you want the truck for comfort. The GM is gonna be a very plush vehicle. Although the Dodge has come along way.
If you want the most bang for the buck. Buy the Dodge. You can buy this truck cheaper than either of the other two with equal packages. Although resale may reflect that down the road.
The GM and the Ford have better Autos available. These 5 spd trannys with braking are the way to go. This is something that all the testers have knocked the Dodge for. If you tow a heavy load with the Ford and then use the Dodge you will be begging for the new Torqshift.
Reliability. I don't think the long term jury is out on the new Cummins yet. But it does have a VERY good track record.
The HO cummins is a great buy. But can only be had in a manual tranny.
The GM and the Ford are California emissions legal. The HO cummins is not.
I have owned Chevys my entire life. The "F" word was not allowed around me. For me to make this switch took A LOT. My decision was based on everything I had read in the shootouts and my experiences with the trucks in my business.
Here are some links that compare the three head to head. I might ad, these shootouts will make one think that there is some bias involved. But in the 10 or more shootouts I've seen between these trucks, all the comments and results have been the same.
I'm quite sure Troutly has read these articles more than once.