Part 1
Scott,
First of all the SL3 S-works and the Fuji are two totally different frames...The SL4 has been described as a great all-rounder and the perfect replacement for the SL3. They also say that the difference between SL3 and SL4 can be noticed in the first few pedal strokes....It is also common talk that the 3 is a better crit bike than the 4. But on the flip side the SL4 is a better open road all round ride...hard to tell but I do like internal cable route.
The SL3 would be my choice if I was just racing crits as it steers so nicely! That matched with a set of tubular 303s would be a lap up the bends. Some people say that the SL3 is hard to get comfortable on, but I did not find such problems. I ran a longer than usual stem because of the amount of hills in Tasmania and found that climbing out of the saddle felt better than in. I am 68 kgs and can pack a quick uphill finish and the SL3 never budged.