If I have a good router table is there a need for a dado stack?
Dado is much faster as far as rate of removal. I tend to switch to a router or router table when doing smaller and more precision work. My dado blade set is a Freud Dial-A-Width, so fine tuning of the cut width is in 0.004" increments.
Depends on wahat you want to do.
I have both but i tend to use the dado stack more.