In polarized glasses, the lenses are made out of glasses, whereas, a special type of polycarbonate material, which is basically a kind of plastic, is used to make lenses for poly polarized sunglasses.
Polarized sunglasses have some advantages over poly polarized. The lenses used in polarized glasses are naturally resistant to scratches due to the strength of the glass used. Therefore, if you have poly polarized glasses, then you will have to be really careful, or else, it will gradually start accumulating scratches on the lenses.
At the same time, the softness and flexibility of the poly polarized sunglasses allows this type to score more, when it comes to their resistance against breakage. If both types of sunglasses fall on the floor, or something heavy falls on them, then the polarized glasses have a greater chance to break compared to the poly polarized ones.
Another major difference between both is their weight as polarized glasses are higher compared to that of poly polarized sunglasses because of the fact the glass material is heavier than soft polycarbonate. Also, the glass requires the lens to be thicker than that of polycarbonate material. So, if you are looking for lightweight sunglasses, then you should consider going for the poly polarized sunglasses.
The price is another major difference between the two. Because of high manufacturing costs involved in making glass lenses, the price of polarized sunglasses is higher than that of poly polarized sunglasses.