I match the needle size to the thread. I usually use Aurifil (50wt) or Bottom Line (60 wt) for piecing. That wt thread would take a 70/10. I've been using universal. Recently I discovered microtex (sharp) needles and prefer them. Having said all this, I have an inventory of 80/12 universal Schmetz needles that I'll use up.
Superior Threads has a pamphlet of needles and threads. It includes the difference of quilting, jeans, universal, embroidery, leather, microtex and metallic needles. I think that coveres it. I got my pamphlet from the Bernina dealership.