I can choose between ‘Universal Plastic Refills For Square Claws’ and ‘High Performance Polymer Flexor Design Integrated To The Rubber Element For Durability’ - ‘Polymer Flexor’!! sounds high-tech!
My biggest problem is blades falling apart from the heat. If I accidentally hit the wiper switch in dry weather (I live in New Mexico) the blade sticks and tears off. I keep them wrapped up in aluminum foil most of the time. Whichever would best tolerate being out in the heat and dry weather would work better for me.