The short bed (sb) is indeed easier to maneuver, park in cities, take on mountain trails. The tighter turn radius can really help, especially if you want to turn around on a trail. High centering (that is, scraping bottom midway between the front and rear wheels on a trail with bad dips) is less likely with the sb.
However, I prefer the long bed (lb) for these reasons:
*you can haul more stuff
*larger fuel tanks etc. won't fit in the sb because the wheel houses are too close to the front wall of the bed.
*larger fifth wheels can be turned easier without hitting the back of the cab
*longer wheelbase is more directionally stable for towing
*sheet of plywood etc. fits with tailgate closed
*with a tool box or tank in the sb, it is harder to carry plywood etc. ; without, the plywood rests on the tailgate, as it would with a lb having a tank in the bed.
*slide in campers are not practical (too small) in the sb
*you can sleep in the lb when on a hunting or fishing trip without removing everything from the bed.
Hope this helps.