It makes sense that the more rare more expensive from new bike would most likely be worth more in the long term.
So with that the gspd is the bike. But in practice there's a lot to be said for the lighter gs. Especially if you ride off road.
On road there's a lot to be said for the bigger tank.
But if your are thinking resale value it's most likely not going to be used off road so I'd say get the pd and don't look back. Besides if you find the you don't like it you could sell it or trade it for a gs.
On vacation for a spell