Been riding both for quite a while and I'd say FKS, the only thing that the jester does better than the FKS is that it is'nt as sensitive about snow stuck under your boot.
Jesters develop slop, are more likely to break (more plastic parts), has'nt got as much elasticity and does'nt play well with worn soles (esp FT/Dalbello). Maybe they're a bit lighter though, it also has a bigger adjustment range.
FKS/Pivot's only con I can think about is the sensitivity for snow, that's why I prefer salomon bindings. I don't really think of the minimal adjustment range on the Pivots as a con.
Hope it made you a little bit wiser