After taking a class aimed at materials used in Aircraft, one of those covered was acrylic. Acrylic scratches very very easily.
Pros and cons of Acrylic vs glass
Acrylic
Light
clear
can be shaped
flexible
cons:
Scratches very easily.
can change color over the years (acrylic acetate is known to yellow over the years)
some cleaners have adverse effects to acrylic
Glass
Pros
strong
scratch resistant
not affected by cleaners
doesn't bow very easily