A few facts
One complicating factor is that we are not comparing just two materials. We are comparing three: quartz vs. engineered granite vs. slab granite. Due to the manufacturing process, quartz countertops and engineered granite counters are closely akin. Slab granite stands alone as the one material quarried directly from the ground.
Quartz vs. Granite: Radon
Radon in granite and quartz countertops is a contentious issue, and like pricing, one with shifting parameters. Radon is a radioactive gas that has been linked to lung cancer. Radon can be found in granite and quartz.
Consumer Reports indicates that a scientist found "almost no radon" in the engineered stones, and very little coming from the granite.
Quartz vs. Granite: Stone or Not?
If your only concern is whether or not your counters are 100% stone, this is pretty much a tie. Granite can come in the engineered stone version, but quartz is always engineered. What does "engineered" mean?
Prominent quartz countertop maker CaesarStone notes that 93% natural quartz aggregates are mixed with the remaining 7% of color pigments and polymer resins. The resins are there to bind the particles together. Engineered granite is made in much the same way. However, since a 100% version of granite (slab granite) is available, the balance shifts to granite.
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