I really liked my 2014 6.4L truck. Comfy, fast, good towing specs, well optioned for a Big Horn package, great exhaust sound, easy to mod.
Really lovin' the 2017 CTD with the Laramie package. Just as comfy (if not comfier with the leather vs. cloth) as the Big Horn, drives nice down the road, just a bit bumpy unloaded (it's a 2500...they ain't gonna ride like a '65 Cadillac) and the nose is heavier so it takes a bit more braking force to stop it. It also understeers a bit more in the corners than the 6.4L did but again, it's a lot heavier on the front suspension.
I guess to sum it up, the biggest difference in the trucks, and the best difference IMHO, is that sneaky fast Cummins.
The biggest gripe I have is TPMS high default PSI issue which can't be solved by the dealer techs now but there are solutions and I hope to remedy that issue soon.