I may in the minority here, but after owning a GS for a year I have to say it's one of the most top heavy bikes I've ever ridden - even with the gas tank under the seat.
The fact it's a bit tall for me plays into this, but I just jumped on a KTM990 Adventure on the weekend and almost dropped it because it was so easy to get off the kickstand - hefted it up like I do my GS and nearly threw it on the ground...
I haven't ridden the Triumph yet, but I plan to. My GS is a great all around bike, but after a year I've come to realize that the vast majority of my time is spent on pavement, and the dirt I do ride is pretty well groomed. I think the Triumph would suit that kind of riding better. I guess you have to be honest about what you'll be doing most of the time.
"What you damn kids need is a right good war" - my father