Keep in mind, quartz heats up quite fast. Trial and error is essential. For me the best temp. gauge is holding my finger an inch above the nail. For me, I know exactly how it should feel when the nail is ready. This took a few days to dial in.
Also, as far as quartz quality, generally, the more you pay, the higher quality the quartz. Any of them should get the job done but for better durability, longevity and flavor a nicer nail will be noticeably different.
“How long will this last, this delicious feeling of being alive, of having penetrated the veil which hides beauty and the wonders of celestial vistas? It doesn't matter, as there can be nothing but gratitude for even a glimpse of what exists for those who can become open to it.”
― Alexander Shulgin, Pihkal: A Chemical Love Story