I prefer the "S", mostly because it looks a lot better than the naked one (in my eyes)...
I had some problems with my wrists because of the clip-ons. Managed to ride about 80 km before i had to stop and rest. I ordered a "LSL Superbikekit" from Louis with a new top yoke and handlebar, so now the bike is perfect for me
It is a little more windy with the higher bar, but a lot more comfortable.