A queen-size bed is smaller than a king-size bed. The exact dimensions of the bed depend on what country the mattress is manufactured for, and the depth of the beds can vary depending on what type of mattress is chosen.
In the United States, a queen-size mattress is 60 inches by 80 inches, and a traditional king mattress is 76 inches by 80 inches. There is also the California king mattress, which measures 72 inches by 84 inches. Which size is most comfortable depends on the size of the person who will be sleeping on the bed and how many people will be sharing the bed.