Polycarbonate
Very Difficult to Break.
Good Fire Resistance.
Approx 88% Light Transmission.
Sensitive to UV/Weathering which can cause it to become yellow and start cracking.
Sensitive to Scratching.
Acrylic
Easy to Break.
Flammable.
Approx 92% Light Transmission.
Good resistance to UV/Weathering.
Less sensitive to Scratching than Polycarbonate.