I don't know
for sure (cause I'm to lazy to google and my credibility is shot anyway
) but I think they're just brand names of the same thing, Lexan and Lucite, it's plexiglass/perspex that is more prone to crack...
I'm not a plastics expert (or ANYkindof) but my cruddy old maze 3 with the poly top is fine, don't treat the poly top as if it's metal and it'll live a long and prosperous existence...