Well if you plan to buy one and store for the next 30 years as a collectible then get the PD version of the GS!!!
The PD version should bring a few more $$$ in 30 years.
Now if you want something to ride. Where do you live??? If the closet gas station in 300 miles get the PD.
The PD will always be worth more $$$ if a comparable GS and PD are available. It's like buying a car with the all the options the extra $$$$ you pay for options will make resale value higher according to KBB.
My take on this is the more options the more stuff to break!!!
The PD looks cool but that big tank gets in the way for most use