Which shelter was the most popular in the World War II?

well the two main types would be the Anderson shelter ( a small house shaped structure made of corrugated iron ) and the Morrison shelter ( a 2 mtr by 4 ft by 2 ft for those who didn't like sleeping out side during the day its a table/bench and by night its a structure with crossed iron wire and wood edges ) the people who cant afford these items would sleep in the public shelters these would mostly be underground train stations.