There is no substantial difference between the products of engineered stone manufacturers, no matter their claims otherwise.

I've never had quartz in a kitchen, but I have had polished quartz in many bathrooms. I have used slabs from Cambria, Pental, Caesarstone and Radianz. No issues with any of them.

My parents have had Cambria quartz counters in 2 kitchens and had no problems with them.

On these forums we do see complaints about MSI quartz, product and installation, so you might want to search through the old threads.

I have a Pental White Thassos quartz countertop on the vanity in my laundry / bathroom. I purchased it as a remnant piece
(cost savings) a few years ago when we had our bathrooms renovated. Looks great; no chipping, no staining, no issues i

Experiment with red wine, balsamic vinegar, coffee, and cooking oil. Left for 4+ hours to the point that some of the liquids were partially evaporated. I wiped off with warm water and a regular soft kitchen brush and every one of these looked completely clean. These were the MSI, Pental Quartz, Della Terra, and Caesarstone and all had equal performance, including the Raw Concrete and Santenay Honed that may be a bit more porous as a finish.

[Edited to add] I went back and looked again. When I tilt the Raw Concrete sample I can see the places where the liquids sat. It's a very faint difference and I couldn't see it looking straight down at the sample. Once countertops are in place I wouldn't be tilting them to the light! So I'm wondering how much this would accumulate over time.

I've read through so many comments about different types of quartz, many of them older and many of them directly contradictory on their experiences with different manufacturers. I had a quartz countertop in the last house that was there when they we bought it; very white background with small translucent and grey chips in it, not sure of the manufacturer. Never had a problem and I did a ton of cooking and baking, including rolling out buttery doughs on it, making vats of spaghetti sauce and pans of curry.

I'm going to talk with the fabricator for the colors I'm choosing and ask their experience with the materials and go with what they say about being called back to deal with staining or chips. The two countertop businesses we're looking at were both recommended by our contractor, who's been in business for years and is highly professional, so that's a good starting point.