Scrims need a lot of washing and use to `break` them in, then they become more workable. Some boil them first.
Micros don`t need this and are more absorbent. As a result, they get wetter quicker and you need to change to a dry one. You`d probably get through more micros than scrim.
Scrim is a good all rounder though and I would always have some at hand.