I am about as anti sportbike as you can get. I have owned 3. Last one was a semi sportbike, an EX500 Ninja, and the riding position was extremely painful. I sold it with very few miles. To me a sportbike is some kind of medieval torture device. No thanks. I don't have a size issue either, but my main bike has to be capable of cross country travel at freeway speeds. I love small scooters (to me, small is actually part of the definition of a scooter) but the big ones feel clumsy and awkward. They seem much wider than a motorcycle. And then there are the small wheels, which, on a small scooter work fine for me, but its a different matter on a large heavy bike at highway speeds. Given a choice between the Burgman 650, Silverwing, or CTX700N automatic, I think I would take the CTX. It is small, nimble, and easy to flat foot in parking lots, and has a very comfortable riding position. And hopefully valve adjustments would be easier, or less frequent.
2002 Vulcan 750, 2001 XT225
2008 Vino 125, 2009 Genuine Stella
2012 Zuma 125, 1980 Puch Newport moped