I don't know.......................having owned close to 100 motorcycles I think it would boil down to where I'm at now. My DRZ400S is a do everything bike but the GS is a lot more comfortable and can do most everything the DR can do.
If I had to choose one it would probably be a DR 650 which can cover both ability and comfort.
However, owning a GS I'd have to stick with it
If I could only have one