I'll try and answer those questions.
When I sat on the Supersport my immediate reaction was that the riding position was almost identical to the RS. I'm getting on a bit and suffer with a bad back so I would never buy a sports bike. I felt the SS was a superb looking motorcycle that was going to be comfortable too.
I originally had a lowered version of the BMW S1000XR on order but when I saw the first demo bike it was just too big, tall and the wide bars a huge concern just moving it about. So I tried an RS and loved it. But even though I had an R1100S quite some years ago I never really fell in love with the RS. I had it from new for almost eighteen months. It's a great bike, easy to ride, handles beautifully and flatters the rider.
It's comfortable and the Sport SE is unbelievably well equipped, much better than the SS 939.
Perhaps it's the old fashioned look of the engine. Whilst it may be all new it rattles like a worn out traction engine and the gearbox oh so clunky. I more or less always wore moulded ear plugs when riding it. But if I didn't, like the other day when I traded it in and left it at the dealer, it just sounded awful. I hope the Ducati is a little bit more refined.
Whilst I love riding, motorcycling is much more to me. It's the whole ownership, the beauty of a motorcycle even cleaning it. I want one that when I walk away I can turn and look at it and think "my that's one fine looking machine" I couldn't do that with the BMW.
Thankfully we are all different, I know many who just love their R1200RS's but sadly not a 100% for me. Don't get me wrong it's one fine motorcycle.