I'm in the market for a new PU to tow my 13,000 gvw WW FSW 3200. The deals on the 2014 around here are $5000+ right off the top... a considerable savings. Trying to get more familiar with the new ...
You can go online and read complaints about Cummins, Duramax and PowerStroke... It doesn't matter which you get if you try to play the numbers, you may end up with one trouble-free or you may end up with a lemon. The achilles heel for all of them is very simple... DPF/SCR/EGR.
Personally, I chose the 6.4L over the 6.7L and it was a great choice for me. Stock for stock, the playing field is pretty level.