How to choose polycarbonate for a greenhouse? Which polycarbonate is better for a greenhouse: secrets from experienced summer residents. The summer season is just around the corner. Gardeners are working hard to prepare their garden plots for the new summer season. Many have abandoned the oilcloth shelters we are accustomed to and use modern materials. In this review we will talk about which polycarbonate is best for a greenhouse, how to choose it correctly and what to look for when buying a shelter.