Glass vs. Polycarbonate Greenhouse - Which Is Better?

Thank you for this quick video.

Hello Trevor ,my greenhouse is polycarbonate,I am pleased up to now ,it was cheaper than glass ,but although it has two windows it tends to get a lot of condensation on the roof,which in turn has lead to a bit of blight on my tomatoes .This is my first year with this greenhouse, so is it a one off or am I likely to have this problem in future years ?