i used both glass and poly and i prefer poly as it warms up earlier in the season without the need for added heat and if it has the cloudy type plastic on the roof then there is no need to paint the glass for shade , but the down side is the panels sometimes blow out of the frame.
Glass looks nicer than poly and very rarely get panels blown out , and due to the weight of glass they normally stay put which is a bad habit of plastic greenhouses of any sort.
The choice is yours but these are a few of the points i can think of.
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ILFRACOMBE
NORTH DEVON
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