I sometimes take a pillion and to be honest I have ridden both and find as a pure road bike I prefer the standard bike. Engine wise they are the same bar the balanced pistons. If I was doing lots of track days then the SP hands down as it really comes into its own with the superior suspension.
I've got both sticker packs 93 and 26 not sure if I will save them for the next owner My lid is an AGV Pista GP 'Project 46' not specifically a nod to Rossi