First of all, there are different levels (quality) of granite. Quartz is not the same. Quartz is quartz (quality). When you see cardboard signs on the side of the road showing granite from $27, I wouldn't put my money on what they're offering. You
can get crap granite. If you're talking apples to apples, quartz is usually cheaper OR at least as cheap as the basic granites; ubatuba, st. cecelia, etc.
So, our position on counter tops is that the designer or contractor should steer the customer in a direction that's in line with what works best. Quartz may not be best to an older couple that rarely cooks. Granite may not be the best choice for a super active family of 6 where maintenance can be an issue. Also, certain areas (location) will dictate what level home should have for materials.
One of the designs we like to promote is using granite for an island and quartz for work areas. This helps show off the granite and keeps low maintenance for the work areas. Don't be afraid to do something a bit outside the box.