Just one extra point about the FS/FS2 ... you have more driveline options than the Durango. One-way diff, normal front diff, separate or linked slipper (soon to be centre one-way option too). May or may not be important depending on how you like a car to feel.
Oh, whilst I think about it you have almost infinite antiquat / kickup / inner hingepi-to-diff height and rear toe options with the FS/FS2 ... I honestly believe it is th emost tunable of the 4wds at the moment ... and that is before you add the new shock tower /camber link brackets I am developing