PolyLite™ PLA-CF is a carbon fiber reinforced PLA.
Your printer will need to be equipped with a hardened nozzle to print PolyLite™ PLA-CF.
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.