From what I've heard from several experts in the field are that the Amino-Functional resins usually test the most durable and from what I've seen that proves to be true. Most warranty sealants I've looked at are Amino-Functional Polymer Resins (Hey, look, a polymer!) and I doubt if they're offering a warranty on something, they'd use a weak polymer. I believe EX-P is such a resin, also, but I'm sure poorboy can come along and tell us more.
The problem for people on the consumer side is that the MSDS sheets don't really tell us what's in the products. The stuff we want to know about the resins, etc. are usually classified as a proprietary substance and doesn't have to be listed. What can we do then? *shrug*
I haven't looked into what "polymers" are used in detailing but I do not even pay attention to that word anymore. Too many companies are claiming this is a carnauba with a "polymer" in it and it'll last longer, etc. The problem is a LOT of substances can be considered a polymer. It really does mean nothing on the chemical level to prove how good a product is. Heck, the plastic in your keyboard is a polymer! Polytetrafluoroethylene is one example... you know, teflon?... It's been claimed to be some awesome detail product (of course by the company trying to sell the wax) but technical data sheets from that polymer's creator (DuPont) says it has to be heated up to high temps (like 500 degrees +) for a period of time to stick to the surface. Paint can't even stand up to those temps! Then how does it bond?!
I just know no product with a carnauba will ever match a pure synthetic. Carnaubas will always create a wetter, deeper surface though. Personally, use a synthetic and top with a carnauba. Works for me.
I say, look at what waxes other people are using and decide for yourself. Many people will use a product and you'll be able to see the durability. If you can get your hands on any professionally done Wax Test, then go ahead and get it... not some group of guys in their back yard...
Edit: Just realized as I was looking at an MSDS that the safe silicones in dressings are also a polymer. They're sometimes also used in waxes as a lubricant and probably also stuck in waxes to fill in swirls... Hey, they're is your carnauba wax with a polymer! Funny how you can easily abuse common terms.