I bought an SS because it was the bike I always wanted, and really like the comfort & low-end grunt (although these are both redundant now that it is enginless). By the time I am done I would have spent less than buying a 916 but I will have something totally unique.
I also personally prefer the look of the front end of the SS, but love the rear end of the 916. And if you don't, then just think what a 916 with an SS seat unit would look like!