cowboydoc, I have never heard anyone, even a Ford mechanic, say that the Powerstroke engine will last longer than the Cummins engine. I'm really a Ford fan, but I have to strongly disagree with that statement. The facts just do not back what you say at all. Just take a look on eBay or any other place selling used diesel pickups. You'll find dozens of Dodges with Cummins engines in them with well over 500,000 miles on them that state that they still run great. I've seen 3 with over 1 million miles on them that have run fine and have never been rebuilt. If you do a search on the Powerstroke engine, you begin to see "freshly rebuilt" engines in the ones for sale with over 200k on them.
The only issue is that the Powerstroke had more power from the factory than the Cummins did. However, with a little tinkering the Cummins can be turned up more and hold the power. Just go to a truck pull or diesel drag race. The Cummins diesel engines dominate there.
It was hard for me, but I bought the Cummins engine and got a Dodge truck that goes around it. On the dyno, my Cummins diesel put out 435hp and 1112 foot lbs. of torque at the rear wheels. And, it really didn't cost me that much to get that much power out of it. I know of hundreds of others who have "turned up" their Cummins engines like that and still have no durability problems. I often have heard debates about the power they can produce, but I've never heard anyone say that the Powerstroke will last longer than the Cummins. Again, I'm a Ford guy and I've heard the same from all of the Ford mechanics I know.
Just for a comparison, attached is a pic of the rods out of a Chevy, a Ford, and a Dodge. Look at the rods and tell me which would be stronger and last longer. The best thing Ford can do is to get the Cummins engines in their trucks since they own Cummins now.