Opinion is split, but I think it is in favour of pencil jets.
You CAN be accurate with fan jets, it was all I used for a couple of years, they do the job perfectly well, but with pencil/needle jets you can operate with a far lower flow rate, thereby making your water go an awful lot further.
For a fan jet to be effective, you need a fairly high flow rate to achieve a decent "fan" of water.
so for me, I am in favour of the fan/needle jet
Ian