I speak from many years experience with both 'Lexan' (polycarbonate) and 'Plexiglass' (acrylic): Acrylic (early developed) is somewhat scratch resistant but cracks easily, because it is hard. I refuse to use Acrylic for M/C windshields because, when it breaks, the edges are as sharp as a knife, and deadly.
Polycarbonate ( later developed) on the other hand, can almost be tied in a knot (if thin enough), but because it is soft, scratches much more easily. Even the 'Hard-Coated Polycarbonate', as used on factory M/C windshields, is easily scratched.
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