PolyLite™ PLA Pro is the first of its kind: combining high durability and high rigidity, this professional PLA offers engineering properties with the printability of regular PLA.
Short Answer:
PolyLite™ PLA is a very hard material with very low impact resistance.
PolyMax™ PLA is an extremely ductile material with high impact resistance and durability.
PolyLite™ PLA Pro is the best of both worlds, combining excellent hardness and high impact strength.