Interesting discussion in this thread. While it is OK to be a fanboy of a specific brand, I really think some folks get a little carried away defending their brand with out-of-ontext statements and just plain false information.
Let's not forget the screwing Ford laid on the Powerstroke users with years of warranty denials as their design evolved. The Duramax had issues too but GM backed them up. The current Powerstroke (Duramax too) have issues albeit not as major as in the past. Ford and the Powerstroke's designer AVL, have managed to get a longer stroke in a V8 configuration bringing the low end grunt closer to a long stoking Cummins in-line six. Yeah for them, this sets the stage for an all around good performing engine.
Most of us here all pulling weights around the country and have little interest in zero to 60 times, or the few seconds difference pulling a load up the mountain. What we really want is good MPG and reliability, and that is exactly what the Cummins delivers historically, something neither GM or Ford can even come close to claiming and supporting.
Maybe the future will change this but Ford is going to have to earn it and so far they are not. They still offer a less powertrain warranty as does GM compared to the RAM Cummins. Ford still will not rate their Superduties against the SAE towing standard, something GM started doing for model year 2016 and RAM has been doing since 2014 model year.