In the UK it’s likely to be the Lean-to design, closely followed by Victorian conservatories.
modern UPVC conservatories differ as they are designed to look good no matter how bad the weather gets thanks to their weather-resistant properties.
Check out Average Conservatory Prices 2019
Orangery prices can be variable depending on the size, shape and style you want for your home. They are typically cheaper than a brick built extension but much more expensive than a conservatory.