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Plexiglass is an acrylic. Easy to cut and bend with heat. I find it to brittle. Even after I was done with my wheel skirts, I started getting cracks. I tried to relieve the stresses by heating, but still they kept cracking and small parts started breaking off.
Lexan is a polycarbonate. Some of the toughest stuff I have ever worked with. It does scratch easier than acrylic, and is much more expensive. It's used in aircraft, and Nascar windscreens. Not as easy to work with, but my Lexan wheel skirts will last the life of my car. Cold bending it with out a metal bending break would be very difficult.
They are both clear plastics, but that's about all they have in common.
I hope that helps a bit
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