I started it with my smart-alek remark about off road and Jeep. Here is my more serious reply.
There are too many variables in all this. Come run Rubicon; you'll run a solid axle. Even in a pickup, for most off-road a solid axle will be better than IFS. IFS might be good for desert running? Running around the Sierra Nevada's, and trips hunting in Wyoming, straight axle is the way to go.
IFS has generally rode better on the street. But, it does not have the flex and wheel travel of a solid axle. If you do lift them, they still do not have the travel or flexibilily/articulation of a solid axle.
FWIW, 400hp and 400ft/lbs power are not always needed. I've been in a number of old flatfender Jeep CJ2A, CJ3B, Ford GPW, that had a flathead 4 cylinders. 60hp motors, that would take those Jeeps places you could never take a Raptor, or Power Wagon, or Sierra, or Tundra.
I've also taken Jeeps between trees and/or rocks on trails, where no full size is going to pass, without a chainsaw or dynamite. Even as much as I like early Bronco's, have seen them have to winched back out, from where they wedged in rocks my Jeep had just gone thru.
For the Power Wagon, disconnect the front and rear sway bars. It would do nicely on open trails.
I would agree, from having run in mud and snow, that a 3/4 ton or larger with a diesel is a pain; no matter the brand, those front-ends are heavy. The biggest thing that limits me off road now, is my Dodge is a long bed xcab. I'm wide, and looooong. Same for my previous F250. My old F250 was gas; the weight was never that much of an issue.
You really have to be more specific about how and where you want to go four wheeling to specify a vehicle.
I would generalize, IMHO, repeat IMHO, and for my kinda wheeling, for general off-road, my following list. If you want to get in to more specific applications, the list would vary:
1 - Jeep CJ/TJ/Wrangler series. Can simply go about anywhere
2 - FJ40 Land Cruiser/early Bronco tie. Bigger, heavier, but can still go about anywhere
3 - Early Scout/Samuri. Decent rigs that can manuever really well.
4 - Range Rover/Nissan Patrol
5/6 - Hummer, Unimog. Work amazingly well, but big for a lot of trails
7 - Mid 70's F150 shortbed. Works really well, but big for a lot of trails
Of course, all this has little to do now with the new Ford
That Power Wagon is a neat truck. My secretaries husband has one, but its no off road vehicle. No 3/4 ton up is from any manufacture. Too big and heavy. It would make a great farm/ranch truck but not for off roading.
First off the HP and TQ are a wash between the two so we can call that a tie.
The Power Wagon has a solid front axle. Great for plowing snow or pulling/hauling a heavy load but not good for off roading.
The Power Wagon weighs about 2,000# more but with the same power as the Raptor.
Again, the Power Wagon has its place but comes no where near the Raptor when it comes to getting off the pavement.
My 1/2 ton with lockers and independent front suspension will go 4 times further than any of my other trucks in the snow and mud. Every 1/2 ton I have owned no matter if it had lockers or not was just plain better in mud and snow than the six 3/4 and 1 tons I have owned from Ford, GM, and your beloved Dodge.