I've been driving Fords and Rams my whole life, starting with an 89 Ram W-150.
If I didn't already want the Cummins diesel engine, I'd be driving a Ford. My 95 Ford F-250 with the 460 V8 was one of my favorite trucks. But I've been doing the diesel thing ever since and Cummins was the only way to fly back then. I put 350,000 miles on my 96 diesel Ram, and then gave it to a friend who still uses it. For the reliable daily driver that I need, everything BUT the engine just got to be a pain to deal with.
That said, this new 6.7L Cummins is so computer-controlled, I don't think it makes much difference anymore whether it's a proper I6 Cummins or a stupid V8 like everyone else has. I'm now 3 years into it with 120,000 miles.