This is the Marmite question for some.
I've had a few curvies and love them. I've now got two Krytens. One K5 naked and one K9 S fully faired. Naked is nice but is missing something. Can't put my finger on it but its no where near as good as my curvy naked.
As for the fully faired I have to admit I FECKING LOVE IT!!! I'm not a small bloke size wise. 18 stone(too many pies) 5'10" and fit snug as a bug on this one. Had Gixer, CBR and a few others. This does it all for me. So much so that I've gone and bought Fuel zaust and a power commandV for it too. Plus lots of other goodies for track days next year.
So in short naked get a curvy
for a faired one get an FI.