How to distinguish between silicone and nylon spatula and judge their quality

My wife and I are currently doing our kitchen, and have done some shopping specifically in this area. We think we are currently leaning towards a gas cooktop, and then a separate wall oven, for cost and design reasons.

But as we originally planned to do a 36" dual-fuel, and did most of our shopping to date around this, here's a few thoughts/things we learned. Our most important feature was the stove top, so most of these thoughts are about that. We're still not finalized, so I'm also curious what answers others post.

• We talked to multiple sales people from multiple local and nationwide stores. There were sales people that told us that Viking & Wolf were comparable. There were sales people that told us that Viking is overrated, not comparable in quality, and even that Viking was the preferred brand. Essentially, we got conflicting reports to where Viking sits. There was no discrepancy however on the quality of Wolf. They all seemed to agree that at that price point Wolf is top (or very near to) in quality, durability and performance.
• For the stove top Wolf and a few others have a double stacked burner. This means that you can do a extremely low simmer (melt chocolate on a paper plate), on the same burner you do max it out to stir-fry. There was one brand (dacor I believe) where the smaller burner was hidden behind a cast plate. This seems to me to negate the fast response of a gas stove, but that might be just my perception.
• In addition to the double-stacked burners, different brands varied greatly on the versatility of the 5 available burners. 1 15K BTU+ burner, 1 simmer burner, etc... vs. 5 that are generally more versatile. That might not be a problem, you can move pots around as you are cooking, but I'd prefer to minimize the amount of moving I have to do by getting more versatile burners (like the Wolf burners mentioned previously) if I'm at that price point.

The old thin utensils were made of Nylon.

The reasons they are hard to find is that traditional Nylon is difficult to manufacture within food standard guidelines for PAA (Primary Aromatic Amines) migration, and does not bio-degrade or burn safely. For relevant references, your local government health department will have papers on PAA migration.

Given that, many utensil manufactures have moved on to other plastics, mostly silicone. Though some use PA66 (Nylon 6,6), which is that thick chunky black plastic stuff.

Try wooden spatulas. They are simple, clean, disposable, and you can get them in thin wedge shapes (e.g. at Asian supply shops).