Would it be better to use a 4pc Moondancer that has a precise staff over martial knowledge with a sharpened?
No. Although you would probably be better using 3 pc moondancer and a random sharp staff.
Sharp is the most OP thing in all of tamriel.
I've actually pulled very good numbers recently with charged staffs and the spinner 5-piece man, works on all magicka classes for ~35k dps on the dummy by yourself, even more with an optimised rotation. Combined with a lightning blockade and a shock enchant, it's really good, especially in Solo and 4-man content. Buffs nearly everyone now that most people put 75 points in thaumaturge.
I'm the designated buffguy in our raids (and I still lack a sharpened moondancer/ia inferno or lightning), so my builds center around this idea and I'm still pulling ahead of many people with BiS-gear (I usually compare my dps based on the percentage that combat metrics shows, if I'm constantly over 12.5% I'm good).