You've been out of the saddle for two years, and the two bikes you are considering are pretty different than what you've been riding for over a decade.
Yeah, as has been said, you really need to ride both. I thought I would like the big GS until I rode one. I though the same about an R1200RT. I've come to realize that I simply like bikes that are little smaller. YMMV.
Perception and emotion doesn't always match up with the reality once your ass is stuck on the thing and you have a payment due next month.
Ride them both, pick the one you find yourself thinking about more when you're falling asleep at the end of the day and still excited about in the morning. I take the same approach with women.
"you want to fix the Pledge of Allegiance, put a disclaimer at the end: with liberty and justice for all...must be 18, void where prohibited, some restrictions may apply, not available in all states."