Are these types of greenhouses out of fashion now?

[Zone6]

I see a lot of people get greenhouses that are half dome bent pipes covered with plastic sheeting. Are these flat glass type of greenhouses out of fashion now?

[TreeGuy]

Glass is better but a lot more expensive. Although you can get better insulation with a double poly cover.

[poncirusguy]

Here are my 4 glass layer greenhouses.

If it works Its right.