I spent 4 days in the Rockies last year with my 2014 Raptor, a Brand new 2015 PW and 2014 Jeep 4 door Sport, all stock except for the winch added to my Raptor. All were very close to their Max weight when we started the trip. The PW with the new rear suspension and 6.4 was really impressive and a goat when it came to tough climbs and the really rough rocky areas. The payload was also better than my Raptor and the ride acceptable for a 3/4 ton and better than any other truck in the 3/4 ton range. Overall it was a better truck for overlanding in the mountains with a 4 day load in the bed and it could really take a beating with less worry about breaking things up front.
That being said, the Raptor was superior on the forest roads, whoops, or anywhere it wasn't exceptionally rough. The ride and handling is better overall but it's a trade off for the payload capacity. The downside of the raptor was its width on tight trails. but it went everywhere the PW did just not quite as fast in the really rough and tight sections of trail.
The jeep was easier on the tight trails and very nimble allowing better lines, but couldn't keep up with either truck when it opened up or got really rough. It was also the only vehicle to get stuck, but only because of a lack of lockers. The Jeep guys whined about the 900 mile drive each way and said they are riding in one of our trucks and towing the jeep next year, which says something about the jeep comfort and on road behavior.
The 6.4 of the PW wasn't as fast as the 6.2 Raptor, but close, and the gas mileage was close between the two at around 12mpg for the trip. The jeep killed us at about 15 mpg but range was less due to tank size.
This year we are also bringing a 4Runner to add to the comparison, we just need to determine where we are headed.
My $.02 from our past experiences.