I have been doing A LOT of research RAM v Ford...
If you have your heart set on a Ford, they are fine rigs. But the last, say 15 - 20 hours, of reading, looking, asking around and experience from my work trucks (All Fords 10-14's) Diesels (lineman work)... There supposed to be some big pros to going new...
1) The 6.7L Ford motor places the turbo is the "valley" of the V8, it gets very hot there and turbos HATE Heat. 2015 I hear they either moved it, or got it a heat shield to try to address it. (Haven't nailed that one down)
2) The fuel system on the "older" '10-14 models have failure issues... From the research I have done, Ford was supposed to have addressed this in 2015's.
3) At work we have A LOT of exhaust issues... but we idle all day and run them hard. Not Ideal for DEF motors, old NON EPA Choked out diesel are made for just that. (Rant over) So something to think about.
4) I do not know why, but it seems Ford has been having issues scorching injectors from about '10-12, we have had two do that.
2015 is supposed to be the Mid-Way point for this "generation" of Ford trucks, that is usually a good time to get one. By then all the makers have usually ironed out the bugs.