Simply explained differences between the two popular stones
Quartz
We all have heard of quartz - the engineered stone used for countertops, back-splashes, floors, walls, etc.. The make-up of the quartz depends on the brand. For instance, Cambria's quartz products are made of about 93% white quartz plus resin and pigment. The quartz is crushed, melted, formed and then baked and polished. Quartz is a very hard stone. The lower grade quartz material has a higher resin content and is low luster. Quartz is stain resistant but not heat resistant. Hot pans can damage quartz like almost all stone. Quartz counters are safe for food preparation. Quartz can stain, chip, burn and yellow from UV rays. Quartz does not have to be sealed and it is easy to clean. There are many patterns to choose from.
Popular brands include Cambria, Caesarstone and Compac. Stone partners
Sintered Stone
Sintered stone is a popular material for indoor/outdoor counters, walls, floors and backsplashes. Sintered Stone is made entirely from natural materials which are formed into strong and durable slabs. No resins nor polymers are used so it is a much cleaner product.
The process is called sintering. Sintering mimics the metamorphic process which takes thousands of years. Sintered stone is extremely resistant to etching, stains, scratches and does not burn. Since it is UV resistant, it can be used outdoors without fading. You can put a hot pot on sintered stone without burning the stone. It is one of the most resilient choices for residential and commercial projects. On the downside, it is more expensive than quartz and the pattern does not run through in the event it is chipped. Sintered stone does not need to be sealed and is easy to clean.
Popular brands include Dekton, Natura, and Lapitec.