I would tend to favor Acrylic/Plexigalss over Polycarb/Lexan. Acrylic comes in a hugh variety of colours, is easy to work with and is much cheaper than polycarb.
Although Polycarb is tougher than acrylic in terms of brittleness and resistance to impact, it does scratch easier than acrylic. Ive never tried polishing it either, but I'm guessing acrylic would polish better too.
Grant