Neither the Ducati nor the Triumph Scrambler, as delivered, are really suited for much more than maintained dirt roads. A KLR is cheaper and better suited to off road riding while still being able to travel the interstates, if necessary, to get to those off road areas.
The Ducati has more power and weighs less than the Triumph, so for paved roads its likely superior. I'm sure magazines will quickly publish comparison tests as the bikes are so similar, not to mention the name of course. That said, I might consider trading my R3T for the new Ducati. I'm not traveling as much as I used to and my rides are shorter. The idea of going back to a basic, lightweight motorcycle is becoming quite appealing. That and I've always thought I'd like to own a Ducati before I'm done.