Polycarbonate is ok, but it yellows, unlike acrylic(perspex), although poly less likely to chip, poly has poorer clarity, and cannot be polishes clear unlike acrylic, perspex is just a trade name, but poly is more impact resistant, so pros and cons for each, acrylic is/should be MUCH cheaper though.
A major disadvantage of poly is it scratches a LOT easier than acrylic.
tabetha