The above also express comparison. The question in this exchange takes up two things, N1 and N2, and asks which is/does more ~. In reply to this, choose either N1 or N2 that is/does more ~ and put it in the phrase "Nの 方ほうが~".
A: 東京と 北海道(と)では どちらが 人口が 多いですか。
Which has a larger population, Tokyo or Hokkaido?
B: 東京の 方が だいぶ 人口が 多いです。
Tokyo's population is much larger.
A: スーパーマーケットと デパート(と)では どちらが 安く 買えますか。
Which offers things at lower prices, supermarkets or department stores?
B: スーパーマーケットの 方が 安く 買えます。
You can buy things at lower prices at supermarkets.